![How much do Gatekeepers and stoppers cost? | The design determines the price [OK Prostate Chip]](/img/a/T0301/eyecatch.svg)
This page is based on entries from "ok-lab's diary" (https://ok-lab.hatenablog.com/), the Japanese development diary written by Mr. Okada, founder of OK Lab, a small company in Japan (Okada Comfortable Life Laboratory). Only the entries about "Gatekeeper and stopper prices" are summarized here, in order of publication. Past prices and sizes are as written at the time. Current prices come from the official product list (retrieved September 4, 2026). Quotations are translated from Japanese.
Note: This page is a personal reading log by someone with no connection to the maker or the seller. It reflects the source entries as of their publication dates and makes no guarantee of accuracy or safety. The product is not a medical device; talk to a doctor about any health decision. Check the official site for current information. This page contains advertising.
In short
Stopper prices depend on the connection, hole count, and custom work.
Mr. Okada provides separate quotations for custom parts and additional work.
The current list prices cable stoppers at ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) and the slide-lock Gatekeeper at ¥6,600, (about $42 at ¥156 = $1, rate as of 2026-09-04) including tax.
About this product
The OK Prostate Chip is a small device that is placed in the urethra (the urine passage) so that it acts on the prostate; the maker sells it in several shapes, sizes and materials. It is made and sold by OK Lab (Okada Comfortable Life Laboratory), a small company in Japan, through its own online store, and prices are in Japanese yen (JPY). The maker's development diary, "ok-lab's diary", is written in Japanese. This page is an English summary of it, and every quotation is translated. OK Lab ships internationally, so readers outside Japan can order (see "Buying from outside Japan" below). Product names on this page are plain-English descriptions. The official Japanese product name is shown once in the product table so you can find the same item in the store.
Before you read: key terms
| Term | Plain-English meaning |
|---|---|
| Gatekeeper | A part at the penis head, intended by the maker to help control chip or thread movement. |
| Sphincter stopper | An internal part behind the main chip, intended to resist movement toward the bladder. |
| Parallel cable | Paired electrical leads for vibrating or electrode chips; dedicated stoppers fit this cable. |
| Safety chip | A small part attached to chip threads, used to keep their ends together. |
| Epoxy resin | Resin used to make stoppers and auxiliary parts. |
| Mesh stopper | A perforated stopper intended to let urine pass through its body. |
| Locking key | A small wire part that holds a Gatekeeper's tube in place. |
| Integrated stopper | A stopper joined directly to a chip or support part to limit unwanted movement. |
| Shape-memory wire | Wire that returns toward a set shape, used in flexible loops and stoppers. |
| Pulley | A small tube channel on a Gatekeeper, used to guide chip threads. |
What happens: Gatekeeper and stopper prices
The OK Prostate Chip is a small device placed in the urethra (the urine passage) to act on the prostate. These entries describe stoppers on its thread or cable, and Gatekeepers at the head of the penis. Mr. Okada presents them as ways to limit unwanted movement of the chip or its connecting parts. Prices changed with different hole counts, attachments, and body shapes.
Three-hole stopper prices separated the part from its machining charge
In an entry published in June 2018, the three-hole sphincter stopper (an internal stopper behind the main chip) was priced at ¥1,500 (about $10 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The stated components were ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) for the stopper and ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) for machining. Mr. Okada offered attachment before delivery when customers purchased the main chip and option together.
(Source: ok-lab's diary, published June 2018)
https://ok-lab.hatenablog.com/entry/20180630/1530342059
Six-hole stopper parts cost ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) more, while the thread-embedding fee stayed the same
An entry published in April 2019 introduced stopper pricing for two-thread chips. Six-hole parts cost ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax more than three-hole parts; the internal stopper was ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada directed buyers wanting an end piece to the separately sold six-hole safety chip (a part that gathers thread ends).
(Source: ok-lab's diary, published April 2019)
https://ok-lab.hatenablog.com/entry/2019/04/27/153239
Parallel cable stopper prices fell after a simpler production method
An entry published in July 2019 introduced a stopper for parallel cable (paired electrical leads), initially proposing ¥1,500 (about $10 at ¥156 = $1, rate as of 2026-09-04) excluding tax. A later entry that month reduced it to ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax after he eliminated a production stage. Earlier custom buyers would not receive refunds.
(Source: ok-lab's diary, published July 2019)
https://ok-lab.hatenablog.com/entry/2019/07/06/152113
(Source: ok-lab's diary, published July 2019)
https://ok-lab.hatenablog.com/entry/2019/07/20/151609
Eight-hole stopper prices matched the earlier six-hole design at launch
An entry published in August 2021 announced an eight-hole resin stopper at ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Its design covered the functions of the earlier three-hole and six-hole parts. The diary announced discontinuation of the previous six-hole sphincter stopper. Mr. Okada said a separate three-hole version in the new resin would offer no price saving.
(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/28/125823
Single-tube Gatekeeper prices separated the body from the tubing
An entry published in July 2022 gave the single-tube Gatekeeper (Unicorn) a proposed body price of ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Plain tubing up to 10cm cost ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax; perforated tubing had separate length-based prices. The diary explicitly discontinued the six-hole Gatekeeper, while saying the older body design remained possible by custom request. Mr. Okada asked buyers of perforated tubing to specify its overall and perforated lengths.
(Source: ok-lab's diary, published July 2022)
https://ok-lab.hatenablog.com/entry/2022/07/16/123031
Gatekeeper cost rose when a decorated locking key became standard
An entry published in August 2022 changed the single-tube body price to ¥5,500 (about $35 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The change included a decorated locking key (a small wire part that secures the tube). The two-tube Gatekeeper (Bicorn) was ¥7,000 (about $45 at ¥156 = $1, rate as of 2026-09-04) excluding tax, with an additional projecting holder and key. Mr. Okada specified that tubing remained a separate expense.
(Source: ok-lab's diary, published August 2022)
https://ok-lab.hatenablog.com/entry/2022/08/06/123150
Slide-lock Gatekeeper cost changed as the October design developed
An entry published in October 2023 priced a new side-opening Gatekeeper at ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax, following a simpler fastening design. Later that month, a more elaborate design was priced at ¥6,000 (about $38 at ¥156 = $1, rate as of 2026-09-04) excluding tax. It included adapters for ordinary parallel cable and a compatible resin safety chip. Mr. Okada said owners of compatible configurations could purchase the Gatekeeper alone.
(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/21/123054
(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/28/122832
Mesh stopper prices differed between fixed and detachable versions
An entry published in November 2023 introduced mesh stoppers (perforated parts intended to allow urine through). The fixed version cost ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax, and the detachable version cost ¥2,500 (about $16 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada favored the fixed version for the stopper nearest the main chip.
(Source: ok-lab's diary, published November 2023)
https://ok-lab.hatenablog.com/entry/2023/11/25/122934
Integrated stopper prices reflected whether the front needed reinforcement
An entry published in October 2025 clarified pricing for integrated stoppers (stoppers joined directly to the chip). A rear-only attachment cost ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax, without the reinforcement previously considered necessary. Reinforcement remained necessary for a front attachment. Mr. Okada said ceramic chips and the blue chip (ブルーチップ) could retain their existing construction for a rear-only attachment.
(Source: ok-lab's diary, published October 2025)
https://ok-lab.hatenablog.com/entry/2025/10/11/123003
Apple stopper prices matched across two different attachment designs
An entry published in December 2025 priced the apple-shaped stopper (Apple stopper) at ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax for either attachment design. One joined directly to the chip; the other remained a separate connected part. Mr. Okada reported greater movement with the separate design and more rigid positioning with the integrated design. He limited resin and stainless-steel chips to the separate design because he lacked a reliable method for direct attachment.
(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/20/123000
Four-hole cable stopper prices increased under the July revision
An entry published in July 2026 raised four-hole cable stoppers from ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) to ¥1,500 (about $10 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada said they had previously shared the two-hole price because demand was limited. The revised price applied specifically to four-hole stoppers. He cautioned that cable length could create additional charges or make some configurations impractical.
(Source: ok-lab's diary, published July 2026)
https://ok-lab.hatenablog.com/entry/2026/07/25/123012
The maker's answer to Gatekeeper and stopper prices
Mr. Okada prices the chosen configuration and treats some changes as separate work.
Six-hole Gatekeeper prices required the option to be specified early
In an entry published in May 2022, a reader asked whether the Gatekeeper also suited ordinary thread-based chips. Mr. Okada responded by developing a six-hole version, with ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax added for that work. He said existing orders could not be converted once the resin had hardened. He asked buyers to specify the six-hole option with their initial order.
(Source: ok-lab's diary, published May 2022)
https://ok-lab.hatenablog.com/entry/2022/05/07/123013
Shape-memory Gatekeeper prices distinguished fixed and movable thread guides
An entry published in July 2025 described a Gatekeeper using shape-memory wire (wire that returns toward a set shape). It had a pulley (a small channel guiding chip threads). The fixed-guide version remained ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax; a movable-guide version cost ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada said the fixed guide would be included as standard, even for other connection types.
(Source: ok-lab's diary, published July 2025)
https://ok-lab.hatenablog.com/entry/2025/07/12/122911
Custom stopper prices gained a separate charge for nonstandard sizes
An entry published in July 2026 announced ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax extra for each nonstandard epoxy-resin stopper or screw-shaped auxiliary part. Particularly unusual shapes and difficult work would receive separate quotations. Mr. Okada warned that repeating an earlier custom design could produce a different quotation.
(Source: ok-lab's diary, published July 2026)
https://ok-lab.hatenablog.com/entry/2026/07/25/123012
Four-hole stopper prices accompanied new size choices in August
An entry published in August 2026 specified four-hole stopper widths: S at 6–7mm, M at 7–8mm, and L at 8–9mm. Thickness was approximately 2.5–3mm, with size assigned after manufacture. The stated price for the adjustable assembly was ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04) excluding tax, including its stopper parts and cable connection. Mr. Okada asked buyers to specify stopper sizes and cable length.
(Source: ok-lab's diary, published August 2026)
https://ok-lab.hatenablog.com/entry/2026/08/01/122916
How Gatekeeper and stopper prices changed over time
| Published | What the diary said then |
|---|---|
| Jun 2018 | Three-hole pricing identified a separate machining charge. |
| Apr 2019 | Two-thread support brought six-hole stopper pricing. |
| Jul 2019 | A simpler production process reduced the cable stopper price. |
| Aug 2021 | Eight-hole resin launched; withdrawal of the previous six-hole stopper was announced. |
| Jul 2022 | The single-tube redesign discontinued the six-hole Gatekeeper. |
| Oct 2023 | A more elaborate Gatekeeper brought revised pricing and included adapters. |
| Oct 2025 | Rear-only integrated stoppers no longer required reinforcement. |
| Dec 2025 | Separate and integrated Apple stoppers received the same price. |
| Jul 2026 | Four-hole prices rose, and nonstandard resin sizes gained an extra charge. |
| Aug 2026 | Hybrid assembly added three two-hole stoppers at ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) each, excluding tax. |
OK Prostate Chip products related to Gatekeeper and stopper prices
The September 2026 product list confirms these prices, including tax.
Products that appear in these entries
| Product (official name) | Price incl. tax | Relation to this topic |
|---|---|---|
| Parallel cable stopper (平行ケーブル用ストッパー追加（オプション）) | ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) | July 2019 introduced dedicated cable-stopper pricing and then reduced the proposed price. |
| Eight-hole resin stopper (八穴方式括約筋ストッパーチップ（生体適合樹脂）) | ¥2,200 (about $14 at ¥156 = $1, rate as of 2026-09-04) | August 2021 introduced an eight-hole part covering the earlier three-hole and six-hole functions. |
| Slide-lock Gatekeeper (スライドロック式尿道ゲートキーパー) | ¥6,600 (about $42 at ¥156 = $1, rate as of 2026-09-04) | April 2026 recorded this Gatekeeper as a separately priced part alongside a customer's chip. |
(Source: ok-lab's diary, published July 2019)
https://ok-lab.hatenablog.com/entry/2019/07/20/151609
(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/28/125823
(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/11/122913
Products the diary mentioned as alternatives
| Product (official name) | Price incl. tax | Relation to this topic |
|---|---|---|
| Three-hole sphincter stopper (三穴方式オプションチップ（括約筋ストッパーチップ）) | ¥1,650 (about $11 at ¥156 = $1, rate as of 2026-09-04) | August 2021 directed buyers wanting a dedicated three-hole part to the earlier epoxy-resin version instead of the new eight-hole resin. |
(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/28/125823
Single-tube, two-tube, and shape-memory Gatekeepers; mesh, integrated, and Apple stoppers; Apple insertion aids; custom cable assemblies:
No matching product can be confirmed on the current list.
Common worries about Gatekeeper and stopper prices
Customer enquiries show that part names and requested configurations affect quotations.
"How was a custom Gatekeeper price obtained?"
In an entry published in June 2022, a customer reported a shifting chip and asked where to order a Gatekeeper and what it would cost. The reply added ¥5,500 (about $35 at ¥156 = $1, rate as of 2026-09-04) for the Gatekeeper and ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04) for the support cable to the existing chip order. The diary does not record the outcome. Mr. Okada's reply directed custom requests through email or the company's own online store's order-notes field.
(Source: ok-lab's diary, published June 2022)
https://ok-lab.hatenablog.com/entry/2022/06/04/123036
"Do double-loop stopper prices include reinforcement?"
In an entry published in October 2025, a customer requested larger double-loop stoppers with a custom cable assembly. The reply quoted ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04) with side reinforcement, or ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04) without it. The customer chose the version without reinforcement, and Mr. Okada made it. Before quoting, the reply asked the customer to clarify whether the requested dimension applied to each loop or the pair.
(Source: ok-lab's diary, published October 2025)
https://ok-lab.hatenablog.com/entry/2025/10/11/123003
"Does an Apple stopper work with every quoted accessory?"
In an entry published in March 2026, a customer changed a vibrating-chip request from an ordinary integrated stopper to an Apple stopper. Staff said the requested second version of the Apple insertion aid was incompatible without additional work priced at ¥550 (about $4 at ¥156 = $1, rate as of 2026-09-04). Staff proposed a third version, and the customer requested a revised quotation.
Mr. Okada then warned that the combined configuration might be too bulky and that compatibility remained uncertain. The diary does not record the outcome. He asked the customer to consider both that uncertainty and the third version's substantially higher price.
(Source: ok-lab's diary, published March 2026)
https://ok-lab.hatenablog.com/entry/2026/03/21/122906
Buying from outside Japan
OK Lab ships internationally to countries covered by Japan Post's EMS courier service. Overseas orders are paid in advance by PayPal. Each order carries a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and EMS shipping is charged on top. These terms come from OK Lab's official sales-terms page (ok-lab.net/docs/law), checked on September 7, 2026; confirm them on the official store before you order, because they can change.
Summary of this article
| What you wanted to know | The answer |
|---|---|
| In short: what determines the price? | The connection, hole count, and requested custom work. |
| About the product: who makes it? | OK Lab in Japan; its prices are in Japanese yen. |
| Key terms: are these parts interchangeable names? | Gatekeepers, internal stoppers, cable stoppers, and safety chips describe different parts. |
| What happens: why do historical prices differ? | Manufacturing changes, redesigned bodies, and included accessories changed quotations. |
| The maker's answer: how are custom costs handled? | Requested configurations, nonstandard dimensions, and difficult work receive specific quotations. |
| Changes over time: what changed most recently? | July 2026 revised custom charges; August added an adjustable hybrid assembly. |
| Related products: what does the current list show? | Cable stopper ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04); eight-hole stopper ¥2,200 (about $14 at ¥156 = $1, rate as of 2026-09-04); slide-lock Gatekeeper ¥6,600 (about $42 at ¥156 = $1, rate as of 2026-09-04); three-hole stopper ¥1,650, (about $11 at ¥156 = $1, rate as of 2026-09-04) including tax. |
| Common worries: does a quotation settle compatibility? | The March 2026 exchange left compatibility uncertain. |
| Buying abroad: what else is charged? | A ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee and separate EMS shipping; advance PayPal payment. |
Source: ok-lab's diary (Okada Comfortable Life Laboratory). The original entries are in Japanese; quotations on this page are translated. Photos and videos are on the original entries.
This article is a summary of the maker's development diary. The product is not a medical device and no result is guaranteed. If anything feels wrong or worries you, see a doctor. Prices, specifications and cautions change, so confirm the latest information on the official blog and the official site. Questions about ordering and shipping go to the seller.