![Is the bumpy prostate chip too large? | The end already caused fit difficulties [OK Prostate Chip]](/img/a/T0607/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 "bumpy flat chips and the custom 15 mm end" 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
- The bumps enlarged the chip's body, while its unchanged end had already caused fit difficulties.
- Mr. Okada added a bumpy version and later accepted a separate customer's request for a wider end.
- No matching product can be confirmed on the current list.
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 |
|---|---|
| Flat-face upward-pressing design | A curved chip shape whose broad face provides the upward push described in the diary. |
| Bumps | Raised features added to the chip's body. What they are intended to achieve: The diary does not explain this. |
| Shaping mold | A form used to make the chip's shape; changing that shape raised manufacturing questions in these entries. |
| Resin | Material added to the chip's end, used in the custom version to create a wider shape. |
| Float-style 4-line support cord | A support arrangement being tested with the bumpy version. Its precise function: The diary does not explain this. |
| Nylon thread | The thread arrangement offered as an alternative to the tested support cord. Its precise function: The diary does not explain this. |
What happens: bumpy prostate chip size and fit
The OK Prostate Chip is a device placed in the urethra (the urine passage) to act on the prostate. These entries concern a large, curved flat chip, described as a flat-face upward-pressing design, and later changes to its shape. One change added bumps to the body while leaving the end unchanged; another widened only the end for a particular customer. The diary records fit complaints about the original end, but no customer outcome for the later custom widening.
The large flat chip began with a shape reflecting Mr. Okada's preferences
In an entry published in November 2021, Mr. Okada discusses a chip with an upward-curving flat face. He distinguishes that design from earlier chips curved in a different direction. The entry introduces it through a simulation using a transparent model of the urine passage.
Mr. Okada writes that he incorporated so much of his personal preference into the shape that he did not expect strong sales. Ceramic production was still something he was considering, rather than an arrangement confirmed in that paragraph. His stated condition was whether the proposed shape could be formed successfully in ceramic.
(Source: ok-lab's diary, published November 2021)
https://ok-lab.hatenablog.com/entry/2021/11/27/124314
The large flat chip's published dimensions described the original A version
In an entry published in December 2021, Mr. Okada identifies the new large flat chip (Mokushi A) by its dimensions. It measured 7 cm overall, with a maximum width of 12 mm and maximum thickness of 6 mm. These were the specifications published for that version at that time.
Mr. Okada also describes an extended personal trial and says the chip was slippery. That account concerns his own experience with the new product, rather than a customer's response to it. The diary does not record a customer fit assessment alongside those measurements.
(Source: ok-lab's diary, published December 2021)
https://ok-lab.hatenablog.com/entry/2021/12/25/123556
A bumpy prostate chip request prompted a change from refusal to development
In an entry published in March 2022, a reader asks whether the large flat chip could be made with bumps. The staff's initial reply says that this was not currently supported because production used a shaping mold (a form used to make the chip). That reply offered consideration of a future bumpy version, rather than immediate acceptance.
The entry then goes further: Mr. Okada says he intends to focus on new ceramic products and respond to the request soon. He explains that the flat chip had sold poorly, so he had not previously planned a bumpy option. The diary does not record delivery to this reader in the March entry.
(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/05/123200
Large flat chip fit complaints centered on the end, even without bumps
In an entry published in April 2022, Mr. Okada reports that several customers could not accommodate the large flat A chip. He describes it as the company's largest chip, larger even than the long 4-point twist chip. He says most people reporting difficulty could not accommodate the end, and that he also struggled considerably with it.
The bumpy version was larger still, although its bump-free end retained the original size. The diary does not record a resolved outcome for those fit complaints. Mr. Okada described the chip as suited to people for whom the long L-size 4-point twist model already fit easily.
(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121
The maker's answer to bumpy prostate chip size and fit
The maker developed the requested texture and support options, while treating a wider end as a separate custom request.
The large flat chip influenced plans for less resin on ceramic ends
In the entry published in March 2022, Mr. Okada praises what he considers ceramic's excellent slipperiness. He says he wants more ceramic designs resembling the large flat chip, with minimal resin (the material added at the end). That is his explanation for the proposed design direction, rather than a measured comparison of materials.
He also reports that ceramic chip sales had fallen sharply as another range accounted for almost all sales. His concern about the ceramic maker's work formed part of his reason for developing more ceramic products. Mr. Okada's stated preference was to expand designs that kept the added resin at their ends to a minimum.
(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/05/123200
The bumpy prostate chip launched with a tested cord and another thread option
In an entry published in April 2022, Mr. Okada announces that the requested bumpy flat chip has joined the lineup. Its initial arrangement was a float-style 4-line support cord (the support arrangement then under testing). He also says that a nylon-thread version could be supplied.
For the standard nylon-thread version, the published surcharge was the base flat chip's price plus ¥1,000, (about $6 at ¥156 = $1, rate as of 2026-09-04) tax excluded. The paragraph does not state the base price, so it does not supply a complete purchase price for that historical version. Mr. Okada offered the nylon-thread arrangement as an alternative to the cord configuration being tested.
(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121
The custom 15 mm end changed width after a new mold was refused
An entry published in September 2023 describes a customer who had tried various chips and found the large flat A chip best suited their body. The customer wanted only its end enlarged; Mr. Okada declined to make a new mold for one person's request. The customer accepted added resin instead, and Mr. Okada widened the end from 12 mm to 15 mm, leaving its thickness unchanged.
The diary does not record how the completed custom build felt in use. No matching product can be confirmed on the current list. Mr. Okada asked customers making similar requests to use the custom wide-end chip's version name (Mokushi A-kai Ver.1).
(Source: ok-lab's diary, published September 2023)
https://ok-lab.hatenablog.com/entry/2023/09/23/121909
How bumpy prostate chip size and fit changed over time
| Published | What the diary said then |
|---|---|
| Nov 2021 | Ceramic production was being considered, subject to whether the shape could be formed. |
| Dec 2021 | The new A version received published overall dimensions. |
| Mar 2022 | An initial refusal of bumps became a commitment to develop that option. |
| Apr 2022 | The bumpy version launched with cord and nylon-thread arrangements. |
| Apr 2022 | Fit complaints identified the unchanged end as a particular difficulty. |
| Sep 2023 | A custom build widened only the end, without changing thickness. |
The diary does not say what the current state is.
OK Prostate Chip products related to bumpy prostate chip size and fit
No current product is directly tied to this topic.
Common worries about bumpy prostate chip size and fit
"Could the large flat chip be made with bumps?"
The reader's question in the entry published in March 2022 concerned adding bumps to the existing flat design. The initial manufacturing answer was negative, followed by a stated intention to develop the requested version. The announcement published in April 2022 confirms a lineup addition, but does not confirm this particular reader's purchase.
That distinction matters to the recorded outcome: the product announcement supplies evidence of development, while the reader's experience remains unknown. The diary does not record whether that reader received the bumpy chip or found it satisfactory. In the April announcement, Mr. Okada also offered a nylon-thread arrangement for the new version.
(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/05/123200
(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121
"Could the large flat chip have a wider end?"
The request in the entry published in September 2023 came from someone who already preferred the flat A chip after trying various designs. It concerned the end alone, rather than a request to enlarge the whole chip or add bumps. Mr. Okada's first refusal concerned making a new mold, and the accepted reply concerned an added-resin custom build.
The entry records a completed dimensional change, but not a follow-up from the customer about its fit. It does not identify that custom build as the bumpy version announced earlier. Mr. Okada's advice for similar requests was to refer to the custom version by its assigned name.
(Source: ok-lab's diary, published September 2023)
https://ok-lab.hatenablog.com/entry/2023/09/23/121909
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.
Summary of this article
| What you wanted to know | The answer |
|---|---|
| What is the short answer? | The bumps and the custom wider end were separate developments, with limited recorded customer outcomes. |
| What is the base product? | A device made by OK Lab in Japan, placed in the urine passage to act on the prostate. |
| Which terms matter? | The flat design, bumps, shaping mold, added resin, and the two support arrangements describe different aspects. |
| What happened with fit? | In April 2022, Mr. Okada reported difficulty accommodating the original end, including difficulty himself. |
| What did the maker offer? | A bumpy version, another thread arrangement, and a later custom build with a wider end. |
| What changed over time? | The entries progress from design discussion to specifications, development, a release, fit complaints, and customization. |
| Is a current matching product confirmed? | No matching product can be confirmed on the current list. |
| What did readers actually request? | One requested bumps; a separate customer requested a larger end on a chip they already preferred. |
| How do overseas orders work? | The stated terms use advance PayPal payment, a handling fee, and additional Japan Post EMS shipping charges. |
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.