From him:
These little beauties were my first taste of a toy or device that was specifically targeted at nipple play. However, this isn't to say that these are intended for first timers. Make no bones about it, these are full on, intensive tools. Don't be intimidated though! Treat them with a measure of respect. Having this pair of clamps means it's a good first step into the big leagues.

For the beginners these aren't a bad starter pair. The clamps have padded tips instead of bare metal. They squeeze instead of bite. They provide hefty pressure on those sensitive bits while still being bearable at rest, yet ramps up to cringe worthy gasps when even lightly tugged. By no means should you feel limited about where to put these either. Anywhere they can get a grasp is more than ok, there's no right or wrong. So try mixing it up between nipples, ears, scrotum, labia, anywhere you think they will have a nice effect.

Some may view this next part as a pro, or a con, determining on your usage: when the skin is damp, or you're just playing with someone who doesn't have pronounced nipples, these can slip off. As they do, the pain level ramps up to near excruciating, until the jaws finally clink shut, no more nipple between them. This is either good, or bad, depending on the users. I'll leave it up to you to decide.

A bit on the composition of the toy: This is almost totally metal in material, with twin small pads between each clamp. They are very easy to clean. A little soap and hot water is all that is needed. Store in a cool, dry place and these little guys should last you a long time.

From her:
As a more experienced player in the world of BDSM than my partner, I consider a good pair of butterfly clamps a must for every toy box. These are a lovely, well-made pair. Although they are light in weight, they can withstand a good amount of pulling, tugging, twisting, etc. The links in the chain are on the larger side, meaning they can easily be hooked up to a more intricate system of bondage.

Typically I do not enjoy receiving pain, especially not through my nipples, which are already pretty sensitive, but these clamps looked so pretty, and my partner enjoyed them so much, that I had to try them. Though they deliver quite a whallop initially (I have to admit, I shed a few tears of regret) they leave my nipples wonderfully sensitive for days afterward, making it well worth the initial pain. I've used them several times since my initial experiment. I am learning to enjoy them increasingly each time. The painful sensation almost feels like waves of water flowing away from my nipples and through my breasts, which become numb after awhile until the clamps are removed, causing a whole new range of sensations, both painful and pleasurable. I'd recommend these to individuals who either already know that they would enjoy some exquisite nipple torture, or for those who aren't afraid to go through a little pain for the reward of a whole lot of pleasure later on.

We're sharing these more than ever recently, and they are doing a great job still. No wear and tear showing, they should stick around for a while.