I purchased this set of O-rings as a backup set for my harness and I must say I am a fan. This set contains four black O-rings in different sizes: 1 1/4", 1 1/2", 1 3/4" and 2". These measurements are the diameter of each ring. The set should meet most people's needs. This size range should allow them to work in most harnesses that have interchangeable rings.

The rings are made out of rubber so they cannot be boiled to sanitize them, which is a bit of a turn-off for me. The rings do seem to attract a bit of lint. I just wash mine with hot water and antibacterial soap after each use since it is better than nothing. A quick spray down with toy cleaner would not hurt either. They are safe to use with any kind of lubricant.

The packaging on the O-rings is a simple clear plastic clam-shell with a piece of cardstock saying what they are. The package is a bit large but could easily be used for storage. The packaging is also fairly discreet; there are no pictures of scantily clad women on this one.

As for use, these O-rings are identical to the ones that come with Sportsheets harnesses so they are a perfect backup to keep in case you lose one of your original rings or one breaks. The rings have a slightly rough texture and a small amount of stretch to them.

The first time I used them was with the Fun Factory Tiger, this toy as ridges down the length of it and I had to fight the O-ring over them at times. Once you get the toy into place the O-ring does a great job of keeping the toy tightly in place. These seem like they would work with a large number of toys and harnesses due to the great variety of sizes that you get in the pack. In all I would consider them a good buy.

I still consider these to be my go-to back-up rings for my harness. The variety of sizes makes them extremely handy to have around.