How do I order a sea-slug chip? | Specify the version and confirm the quote [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 "ordering a sea-slug version by name" 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

Sea-slug orders specify a version; ordinary size-menu choices do not change that version's body size.

Mr. Okada clarifies the shape, ordering category, and accessory compatibility before accepting some requests.

Today's listed ceramic ordering categories cost ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04) for semi-long and ¥6,600 (about $42 at ¥156 = $1, rate as of 2026-09-04) for long, including tax.

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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: sea-slug chip orders

The OK Prostate Chip is a device placed in the urethra to act on the prostate. If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away. If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately. The sea-slug ceramic chip (Umiushi) is a custom shape used there, with different versions identified in customer requests. According to Mr. Okada, its shape is intended to influence how the chip stays in place. The version identifies the requested body, while separate order details specify added bumps, retrieval threads (cords intended for retrieval), motors, or linked components.

Sea-slug chip orders used the semi-long category for version 3 revision 1

In an entry published in December 2019, a customer wanted sea-slug version 3 revision 1 but selected the long ceramic item. Mr. Okada corrected the category to semi-long and quoted ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04), replacing the selected item's ¥6,600 (about $42 at ¥156 = $1, rate as of 2026-09-04) price.

The diary does not record the outcome. Mr. Okada directs buyers to specify the requested sea-slug version in the remarks for the semi-long ceramic item.

(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/14/151232

A sea-slug chip photograph helped identify the requested revision

In an entry published in April 2020, a customer requested sea-slug version 1 revision 1 after seeing another website. The customer described a 45mm body with a 10mm width, and Mr. Okada identified a photograph in his own diary.

The diary does not record the outcome. Mr. Okada asks the buyer to check that photograph and report any mismatch with the intended shape.

(Source: ok-lab's diary, published April 2020)
https://ok-lab.hatenablog.com/entry/2020/04/04/152310

Surface inspection led to a promised remake of one sea-slug chip

In an entry published in May 2020, a customer requested sea-slug version 3 revision 1 with a stopper. Mr. Okada writes that magnified photography revealed a surface defect he had not easily seen unaided.

He distinguished the concerning rough spot from ordinary variations in glaze (the ceramic surface coating). Mr. Okada says he would remake that chip.

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/16/131332

Sea-slug chip size selections did not produce different bodies

In an entry published in August 2020, a customer selected both S and M entries for sea-slug version 3 revision 1. Mr. Okada explained that those selections would produce the same chip because that version had no separate size range. The customer accepted his explanation before the order proceeded.

(Source: ok-lab's diary, published August 2020)
https://ok-lab.hatenablog.com/entry/2020/08/15/125150

Sea-slug version 5 required bump charges for both component chips

In an entry published in April 2022, a customer requested sea-slug version 5 using short and semi-long ceramic items. The order also included ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) for the connection work. Mr. Okada explained that both chips had bumps as standard for this version, requiring another ¥2,200 (about $14 at ¥156 = $1, rate as of 2026-09-04) for those options. The diary does not record the outcome.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/09/123458

Sea-slug version 4 bleeding prompted inspection, followed by a refund offer

In an entry published in April 2023, a sea-slug version 4 customer reported heavy bleeding and questioned an area without a glass-like finish. OK Lab staff initially offered inspection followed by repair or replacement. After examining the returned chip, staff judged the thin resin coating (joint-covering material) unlikely to explain the bleeding and declined replacement.

Mr. Okada attributed reports of bleeding during difficult removal to this version's shape. The diary does not record the outcome. Mr. Okada offered a refund if the customer would not accept the chip's return unchanged.

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

A complex sea-slug chip request needed clarification before production

In an entry published in December 2024, a customer requested sea-slug version 4 with a bladder loop (a wire loop intended for the bladder). Mr. Okada tested a different short ceramic twist prototype and reported poor fit, urinary urgency, and pain. He abandoned that test after 5 hours.

He also announced a changed bladder-loop connection for future assemblies containing a ceramic chip. The customer had agreed to consider his questions, but a detailed reply had not arrived by publication. Mr. Okada asks for a clearer drawing because he might have mistaken 110mm of thread for a loop dimension.

(Source: ok-lab's diary, published December 2024)
https://ok-lab.hatenablog.com/entry/2024/12/21/122903

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The maker's answer to sea-slug chip orders

The maker changes some requested combinations when their parts would interfere with the intended design.

Sea-slug version 4 needed a different stopper with separate threads

In an entry published in September 2020, a customer wanted sea-slug version 4 with separately attached threads. The order included a six-hole sphincter stopper (an accessory intended to limit the main chip's movement into the bladder). Mr. Okada explained that a shared stopper would largely cancel the separate attachment points' purpose.

The customer agreed to change the order. Mr. Okada recommended a three-hole stopper instead for that configuration.

(Source: ok-lab's diary, published September 2020)
https://ok-lab.hatenablog.com/entry/2020/09/26/124400

A vibrating sea-slug chip order changed because the motor obscured version 4

In an entry published in October 2020, a customer requested both ordinary and vibrating sea-slug version 4 chips with bumps. Mr. Okada explained that the motor (the component producing vibration) would cover the vibrating chip's distinctive rear shape. Following that advice, the customer changed the vibrating order to version 3 revision 1.

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/17/121023

An earlier linked sea-slug chip request received a movable alternative

In an entry published in February 2026, a customer requested the earlier linked sea-slug 4+5 arrangement. Mr. Okada proposed the movable version, a named alternative connection for linked chips. His quote included ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04) for reinforcement and connection work, alongside separate chip and bump charges. The diary does not record the outcome.

(Source: ok-lab's diary, published February 2026)
https://ok-lab.hatenablog.com/entry/2026/02/21/122935

A vibrating sea-slug chip needed another stopper to avoid added thickness

In an entry published in August 2026, a customer wanted vibrating sea-slug version 2 with an apple stopper. The customer requested the stopper's standard thickness. Mr. Okada replied that the cable-mounted option would be 9mm or thicker, far from that request.

The dated quotation changed the stopper charge from ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04) to ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04). Mr. Okada proposed the standard cable stopper instead, and the customer accepted it.

(Source: ok-lab's diary, published August 2026)
https://ok-lab.hatenablog.com/entry/2026/08/01/122916

If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away. If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately.

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How sea-slug chip orders changed over time

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OK Prostate Chip products related to sea-slug chip orders

Current catalogue prices identify ordering categories and accessories; the diary's custom quotations describe particular builds.

Products that appear in these entries

(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/14/151232

(Source: ok-lab's diary, published September 2020)
https://ok-lab.hatenablog.com/entry/2020/09/19/123115

(Source: ok-lab's diary, published September 2020)
https://ok-lab.hatenablog.com/entry/2020/09/26/124400

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/09/123458

Products the diary mentioned as alternatives

(Source: ok-lab's diary, published September 2020)
https://ok-lab.hatenablog.com/entry/2020/09/26/124400

(Source: ok-lab's diary, published August 2026)
https://ok-lab.hatenablog.com/entry/2026/08/01/122916

Custom sea-slug versions, linked builds, prototypes, and the apple stopper:

No matching product can be confirmed on the current list.

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Common worries about sea-slug chip orders

Reader questions distinguish fixed ceramic bodies from custom thread work and experimental motor requests.

"Can a sea-slug chip have different body lengths?"

In an entry published in December 2019, a customer wanted versions 3 revision 1 and 2 revision 2 and asked about different lengths. The request also specified a thread length, which was a separate part of the order. The diary does not record the outcome. Mr. Okada's reply ruled out changing the ceramic body sizes.

(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/28/131319

"Can any motor work with a sea-slug chip?"

In an entry published in May 2020, a customer proposed a sea-slug chip with a supplied linear motor (a motor with a back-and-forth weight). Mr. Okada agreed only to assess whether a strong, waterproof connection was possible. After receiving the motor, he reported weaker vibration than expected.

The customer authorized work using version 2, which Mr. Okada had suggested for its perceived stability. The diary does not record the outcome. Mr. Okada cautioned that the finished motor section would measure at least about 12mm.

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/30/125906

"Does a sea-slug chip with separate threads cost extra?"

In an entry published in September 2020, a customer asked whether version 4 could have threads attached at separate points. Mr. Okada confirmed that configuration and quoted an additional ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04). He also described different terminal-piece sizes to distinguish the threads. For future orders, Mr. Okada asks buyers to select the extra nylon thread option.

(Source: ok-lab's diary, published September 2020)
https://ok-lab.hatenablog.com/entry/2020/09/19/123115

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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 (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.