One chastity device ships in three days, the other takes two months, and only one of them tells you its size

If you are buying a chastity device from Japan, the number that will decide whether you wasted your money is the inside diameter. It is also the number most listings do not print.

I pulled the two ends of the range off one Japanese shop to show what I mean. Same shop, same category, and almost nothing else in common.

The cheap one hides the size and takes two months

Read that dispatch line again. One to two months before it leaves Japan, and that is before international shipping. Order this in August and you may be looking at October.

Then look at the size row. There isn't one. No length, no inside diameter, nothing. For a category where fit is the entire product, that is a strange thing to leave out.

And the two people who reviewed it both, independently, mention it running tight. One got it to work with lubricant, one could not wear it at all. Two reviews is not a sample and I would not treat it as one, but when two out of two say the same thing about fit, on a product that publishes no measurements, that is worth more than the 5.0 sitting above them.

The expensive one publishes the size and has the worse rating

78mm long, 36mm inside diameter, ships in two or three days. Nine dollars more than the other one, and a 2.2 average.

Here is why I would still look at this one first. The 2.2 is not about the product being bad. One of the two reviews is a delivery complaint: parts missing from the box, despite a sticker on it reading "QC Passed". The other says it works fine and is well made, but that they ordered the long version as a hedge and it turned out longer than they wanted.

Neither of those is "this device is poorly designed". One is a packing failure and one is a sizing mistake the buyer made themselves, on a product that told them the measurements up front.

That is the whole argument for reading the reviews instead of the number above them. A 2.2 from two people carries no statistical weight at all. What it carries is two specific stories, and the stories point somewhere completely different from the score.

Why 36mm is the number to write down

If you have never bought one of these, the inside diameter is the ring that sits behind everything, and it is where fit succeeds or fails. Too wide and the thing slides. Too narrow and you take it off within the hour.

Length is the forgiving dimension. The review above tells you that directly: they took the long one to be safe and found it too long, which is an annoyance rather than a disaster. Diameter is the unforgiving one.

So the practical order of operations before you buy anything in this category:

1. Find the inside diameter. If the listing does not give one, you are gambling.
2. Compare it against something you can measure at home rather than guessing.
3. Only then look at price, colour and everything else.

Doing it in that order eliminates most of the products on most Japanese shops immediately, because most of them fail step one. That is a feature of the process, not a problem with it.

What I am not telling you

Which one to buy, and how either of them feels. I have not worn them and I am not going to write as if I had.

What I can do is read the Japanese product data, convert it, and put the shipping reality next to the price, because that is the part that never makes it into English listings. Between these two, the honest summary is: one tells you what you are getting and arrives this week, the other does not and might arrive this autumn.

There is a separate piece on why the shipping cost itself is never printed anywhere, which applies to both of these.

Before you add anything to a basket, find the inside diameter. If the page does not have one, close the tab.

Prices, sales counts and review counts in this article are from the date shown next to them. Japanese shops run sales constantly, so check the store page for what it costs today.