The rings (or more accurately- clamps) look simple, but they work surprisingly well in a plethora of different ways.

Right off the bat, they are very firm nipple clamps that stay put very well and apply a decent amount of pressure. However, if you aren't much of a fan of pain, the initial strength will probably be too much for you. If you're big on the masochism, these can be a lovely starter clamp. The shape lends itself very easily to being connected to rope, a leash, or perhaps small weights. They also have a small weight of their own that will shift depending on the way they face, meaning that if the wearer jumps, moves quickly, or bumps into them, the weights will tug down with gravity for a fun little jolt.

These can be worn for an extended period of time because they don't pop off easily and could be worn under a bra or thick shirt discreetly. However, the longer you wear them, the more intense the pain will be when they are removed. So a word of caution to anybody with a low pain tolerance.

Now, a few tips: you're not going to want to use this on wet or lubricated skin. It will slide off rapidly and might pinch way too hard as it's flying off of you- leaving a blood blister or broken skin. You can also take some pliers (or some really brawny fingers) and pry them wider to lessen their intensity if they are too strong for your tastes.

Also, keep in mind that while these are nipple clamps, they aren't required to stay just there. The sensation can feel quite pleasant along other parts of skin. Ears, lips, perhaps between the fingers if you're looking for a very unique sort of sensation, possibly genital areas as well- however you would want to be wary of it being too slippery to stay in those regions.