These were my first experience with butterfly style clamps and I had no idea what to expect. I'd heard they were stronger and thus more painful than tweezer style clamps and wow, is that accurate! These clamps have a hell of a pinch! The second I put these on, I was giggling in reaction to the intense pain in my nipples and reaching up to grab and hold them to try to ease the pressure. Since I enjoy pain so much, I really loved these clamps, but they are definitely not for beginners or people who don't like a LOT of pain, because that is all you will get with these clamps!

These clamps are made entirely of metal save for the small plastic "pads" where the clamps come together on the nipples. Since they're metal, the texture is smooth and cool, but heavy. The metal is well finished, so it doesn't scratch or pinch in the wrong places. The plastic pads are not completely smooth and leave little bumps on the pinched area, but since these clamps are designed to give pain, it's not more noticeable than the sensation of the clamps themselves.

I think these clamps would fit any size nipples and are extremely easy to use. Just squeeze and release to open and close them! You cannot adjust the tension, so the clamping sensation is VERY strong on these! The chain is long enough to reach between both nipples with extra length leftover. The chain is about a foot long.