This is a good product, note that the competitor will charge upwards of 70$ for the same piece. So for the price, the quality cannot be beat. My intention was to get anklets for extended wear like my eternity collar (which I have worn straight for over half a year without removing or any difficulties). Needless to say, I wanted something fairly permanent and durable. So after some time with these locked on 24/7 I have come up with this assessment
The product is a set of two oval shaped bands, that open from hinges lengthwise. It is locked via a very small allen key, leaving nothing sticking out that can assist in removal. There are two keys, one comes with a hole for a keychain. The one that I ordered also came with two O rings that can be slid on prior to use.

Pros:
-this thing IS durable. Once on, the only thing removing it is your key (the package comes with one hex-like one, and one for a keychain). I have tried prying it off on my own,
-It is stainless steel so you can get it wet or expose it to the elements without damaging them.
-The o ring makes it a great for bondage play
- it looks great, and subtle. If worn in public, it may even pass off as a fancy anklet or bangle making this ideal for 24/7 SM relationships.
-The weight of each is light, about a pound, so it won't mess up active lifestyles.

Cons:
-Order is true to measurements, be sure to allow yourself a little space so that you can move. Having unyielding metal near joints can causing chafing. My ankle cuffs are a bit big, so upon long periods of walking, it would chafe. I got around this by having socks if I plan to walk a lot, and by adding a little padding underneath. If comfort is a big thing, consider getting a little silicone tubing or some tape for the front and back
-For very long periods of walking and moving, the screw keeping this locked on came loose and I could remove it. This happens after days of moving around though. Its an easy fix though, you could simply tape the front or back or apply a little tubing here to keep the screw in place for added security. This may also prevent tampering from your sub too. Additionally, checking the screw every now and then would be beneficial too.

All in all an important part of things I have tried, I hope these become a bit more standard so they can be a little more customized and better fitted.

Perfect!! Only one very important thing you will need to wear very thick socks with these since they sit right on a tendon.. so plan on that or you won't be able to walk very far. The thick socks provide relief from the ankles putting pressure on your tendon.

Ok so we recently got them in. We were looking for cuffs smooth all around and we found them. It came in a little bit larger in size (diameter) than what I expected so they fit her a little more loose than I wanted however that's no big deal. They feel great and they do not bother her during daily movement and routine and they're also very light weight.

The only thing I would change is as you can see in the photo they send you a tool to open and close these cuffs. It would help if the small bolts were a little bit larger and or the tool was magnetic.
They DID send a couple of extra ones in case one gets dropped or lost. Yet and still the size makes it difficult to work with a bit.

However overall I would absolutely recommend