Do longer sounds and extensions cost more? | Length and construction both affect prices [OK Prostate Chip]

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 sound, tail, and antenna prices by length 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.

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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

• Longer sounds and extensions sometimes cost more because they require different construction or joined sections.
• The maker quoted separate prices for length bands, materials, and additional parts.
• The current product list does not confirm these custom length options.

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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.

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Before you read: key terms

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What happens: urethral sound and extension prices

The OK Prostate Chip is a small device placed in the urethra (urine passage) to act on the prostate. Sounds (elongated urethral instruments) can serve as separate devices or connect to chips. A tail (tube-covered nylon thread) sits behind the chip, with its covered portion intended for the urethra. An antenna extension (fine wire and thread inside tubing) serves positioning and retrieval purposes, according to Mr. Okada.

Jointed sound prices began with a separate charge for each unit

In an entry published in January 2023, Mr. Okada introduced a 2-wire jointed sound after a customer's earlier wire-based device broke. Its jointed section (short resin segments along paired cords) was priced separately from the tip.

Each 15mm counted as 1 unit, costing ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The maximum was 12 units, or 18cm, priced at ¥6,000 (about $38 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada recommended a narrow, curved resin tip for this design.

(Source: ok-lab's diary, published January 2023)
https://ok-lab.hatenablog.com/entry/2023/01/21/122941

Cushioned sound prices added another fee according to jointed length

In an entry published in February 2023, Mr. Okada introduced silicone cushioning between the jointed sound's resin segments. The cushioning cost ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax per 10cm, added to the underlying jointed sound price. For the maximum 18cm length, the addition was ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada recommended this version because he wanted the gaps between segments covered.

(Source: ok-lab's diary, published February 2023)
https://ok-lab.hatenablog.com/entry/2023/02/11/123054

Flat sound prices started with three fixed length bands

In an entry published in February 2023, Mr. Okada introduced a flat sound made from parallel silicone-covered metal wires. Prices excluding tax were ¥2,500 (about $16 at ¥156 = $1, rate as of 2026-09-04) for 10cm, ¥4,500 (about $29 at ¥156 = $1, rate as of 2026-09-04) for 20cm, and ¥5,500 (about $35 at ¥156 = $1, rate as of 2026-09-04) for 25cm. He said his workspace prevented making longer versions at that time. Mr. Okada recommended the flat design as a standalone sound.

(Source: ok-lab's diary, published February 2023)
https://ok-lab.hatenablog.com/entry/2023/02/18/122910

Combined sound prices charged rigid and flexible sections separately

In an entry published in June 2023, Mr. Okada introduced a sound combining rigid and flexible sections. The rigid portion cost ¥2,500 (about $16 at ¥156 = $1, rate as of 2026-09-04) excluding tax up to 10cm; the twisted version cost ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The flexible portion cost ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax for each 1.5cm. Mr. Okada asked buyers to specify the rigid length and choose the flexible length in those increments.

(Source: ok-lab's diary, published June 2023)
https://ok-lab.hatenablog.com/entry/2023/06/03/121955

Tube tail prices initially covered lengths up to 10cm

In an entry published in November 2023, a 2.5mm tube tail cost ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax up to 10cm. The shortest technically feasible length was approximately 3cm, because its ends required fastening. Shorter lengths were possible, but Mr. Okada saw little reason to shorten the standard example. He recommended 10cm and invited enquiries about longer tails.

(Source: ok-lab's diary, published November 2023)
https://ok-lab.hatenablog.com/entry/2023/11/25/122934

Tube tail prices later covered 15cm before reaching another band

In an entry published in December 2023, the tail price covered lengths up to 15cm for ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The next band, 16–25cm, cost ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada attributed the higher charge to less efficient work on longer pieces. He asked customers wanting greater lengths to enquire individually.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/09/123055

Double-tube tail prices rose with the more substantial construction

In an entry published in June 2024, a customer asked about a less flexible attachment for a custom chip assembly. Staff said the ordinary tail lacked the requested stiffness, prompting Mr. Okada to develop a double-tube version.

The prototype had a 2mm inner tube inside a 4mm outer tube, with nylon thread inside. Adding it cost ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax up to 15cm, or ¥4,500 (about $29 at ¥156 = $1, rate as of 2026-09-04) excluding tax up to 25cm. Mr. Okada proposed this construction instead of the electrical cable suggested by the customer.

(Source: ok-lab's diary, published June 2024)
https://ok-lab.hatenablog.com/entry/2024/06/01/123036

Antenna prices depended on tube diameter as well as length

In an entry published in April 2025, Mr. Okada introduced extensions containing 0.2mm shape-memory wire (wire providing a returning spring force) and nylon thread. Up to 10cm, the 2.5mm tube version cost ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax, while the 1mm version cost ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Both added ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax for lengths beyond 10cm, up to 20cm.

The 1mm version had a 20cm manufacturing limit because of the difficult work involved. For longer requests, Mr. Okada offered the 2.5mm version up to 30cm, with a further ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax charge.

(Source: ok-lab's diary, published April 2025)
https://ok-lab.hatenablog.com/entry/2025/04/12/122910

Apple-shaped sound prices gained a confirmed 35cm custom tier

In an entry published in January 2026, a customer confirmed a request for a 35cm original apple-shaped sound. Staff accepted the request, and the diary showed the finished item beside a shorter example. Mr. Okada confirmed prices excluding tax of ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) up to 20cm, ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) up to 30cm, and ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) up to 35cm. He said orders could be accepted under those confirmed bands.

(Source: ok-lab's diary, published January 2026)
https://ok-lab.hatenablog.com/entry/2026/01/10/122922

Apple-shaped sound prices changed again with Version 2 construction

In an entry published in March 2026, the apple-shaped sound Version 2 introduced a spring grip requiring a rubber or tube contact surface. Bare ceramic or resin surfaces did not provide the grip Mr. Okada wanted. Prices excluding tax were ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) up to 20cm and ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) up to 30cm. For suitable chip ends lacking rubber, Mr. Okada offered a compatible rubber addition for ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax.

(Source: ok-lab's diary, published March 2026)
https://ok-lab.hatenablog.com/entry/2026/03/14/122910

Apple-shaped sound prices increased further for Version 3 rubber grips

In an entry published in March 2026, Mr. Okada introduced Version 3 with rubber membranes on the sound's gripping surfaces. Its published totals were ¥7,000 (about $45 at ¥156 = $1, rate as of 2026-09-04) excluding tax up to 20cm and ¥9,000 (about $58 at ¥156 = $1, rate as of 2026-09-04) excluding tax up to 30cm.

Mr. Okada attributed the expense partly to difficulty producing even rubber membranes. He also reported thread tangling and unwanted movement of the chip together with the sound. He cautioned that the added thickness could prevent some combinations from fitting.

(Source: ok-lab's diary, published March 2026)
https://ok-lab.hatenablog.com/entry/2026/03/21/122906

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The maker's answer to urethral sound and extension prices

The maker offered replacement constructions, a shorter antenna price tier, and joined extensions for requests exceeding a single piece's limits.

Discontinued cable designs led to a different jointed sound quote

In an entry published in April 2023, a customer requested a custom vibrating assembly with a 6-wire cable. That cable had been discontinued. The replacement quote included jointed sections of 1cm for ¥550 (about $4 at ¥156 = $1, rate as of 2026-09-04) and 8cm for ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04). The diary does not record whether this order was completed. OK Lab proposed changing the request to a 2-wire design.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/22/123057

Short antenna prices gained another tier for joined extensions

In an entry published in May 2025, a customer wanted a firmer extension with a petal-shaped end loop. Mr. Okada initially favored a softer antenna, but the customer considered it too flexible.

The published antenna prices gained a ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax tier up to 5cm. A crossed end loop added ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax; a petal-shaped end loop added ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada proposed a 5cm firmer section joined to a 5cm softer antenna, and showed the completed build.

(Source: ok-lab's diary, published May 2025)
https://ok-lab.hatenablog.com/entry/2025/05/03/122907

Joined antenna prices allowed more adjustment without raising that quote

In an entry published in August 2025, a customer asked for additional adjustment length beyond the initial antenna proposal. Staff said the quoted amount would remain unchanged up to a combined 30cm. The customer accepted the revised arrangement, and the diary showed the completed item. Staff recommended 10cm plus 20cm, with the longer section providing the adjustment range.

(Source: ok-lab's diary, published August 2025)
https://ok-lab.hatenablog.com/entry/2025/08/02/123058

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How urethral sound and extension prices changed over time

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OK Prostate Chip products related to urethral sound and extension prices

The current list includes the vibrating ceramic chip named in the March 2026 compatibility question.

Products that appear in these entries

(Source: ok-lab's diary, published March 2026)
https://ok-lab.hatenablog.com/entry/2026/03/21/122906

Products the diary mentioned as alternatives

The diary names no alternative.

Custom sounds, tails, and antenna extensions: No matching product can be confirmed on the current list.

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Common worries about urethral sound and extension prices

Length questions received different answers depending on construction and the customer's proposed combination.

"Do custom flat sound prices change just above 10cm?"

In an entry published in April 2023, a customer asked about a sound used with an external support device. Staff first declined a separate hook design because they could not reproduce a reliable personal fit. The customer's follow-up concerned the flat silicone-and-metal sound.

Mr. Okada offered custom lengths up to approximately 12cm at the 10cm price, with longer requests at the 20cm price. He favored that flat construction over silicone tubing or the jointed design for the proposed combination.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/08/122508

"Why did antenna prices jump for a 27cm request?"

In an entry published in July 2025, a customer questioned why a 27cm antenna quote reached ¥9,900 (about $63 at ¥156 = $1, rate as of 2026-09-04). Staff explained that this construction had a 20cm limit per piece. Published prices were ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04) up to 10cm and ¥5,500 (about $35 at ¥156 = $1, rate as of 2026-09-04) up to 20cm.

The requested length therefore required 2 sections, rather than another ordinary length band. The customer proceeded with the joined design. Staff offered either 20cm plus 7cm or 10cm plus 17cm at the same quoted price.

(Source: ok-lab's diary, published July 2025)
https://ok-lab.hatenablog.com/entry/2025/07/26/122909

"Do apple-shaped sound prices include compatibility with every stopper?"

In an entry published in March 2026, a customer requested an integrated apple-shaped stopper on a vibrating ceramic medium-length chip. Staff said the entirely resin stopper would not work with Version 2, but offered added rubber for ¥550 (about $4 at ¥156 = $1, rate as of 2026-09-04). They also offered Version 3, which the customer requested for a revised quote.

Mr. Okada then questioned the combined thickness and cable clearance; the requested build had not been made. The diary does not record whether that revised order was completed. Mr. Okada suggested considering rubber on the cable with Version 2, while saying he could not identify a definite best choice.

(Source: ok-lab's diary, published March 2026)
https://ok-lab.hatenablog.com/entry/2026/03/21/122906

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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 (written here as plain text, not a link: ok-lab.net/docs/law), checked on September 7, 2026; confirm them on the official store before you order, because they can change.

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Summary of this article

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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.