I have known and used these specific nipple clamps or nipple-clips for over 20 years. Classic type of nipple clamp. They are indeed "Comfort" (comfortable, in this case someone would call them gentle). This classic type of nipple clamp has been used by many women over the years and is the best type of clamp, especially for girls who are using nipple clamps for the first time. They have protective silicone covers (which can be removed if you want) for better stabilization on your nipples (they "stick" without slipping) and also protect your nipples because they do not come into direct contact with the metal of their construction. They are available on the market in various colors. My favorite color, of course, is pink. They also have an adjustment screw to maintain clamping resistance in case you have overly sensitive nipples and can't stand them for long. Personally, I always removed the screws because they got in the way and caught on my bra. Imagine that I have left them on my nipples many times all day long. They are "light clips," meaning they are not very tight (due to their construction), they feel almost the same as classic (wooden) clothespins (also widely used by women on their nipples).
They can also be used as clamps on the labia. Personally, I own several such types of clamps for various uses on my body.
Also, if you want to "play" with them erotically and you like the sensation of electrostimulation, you can remove the rings with the bells at their ends and place there (at the bottom) T.E.N.S. cables with 4mm banana-plug connectors, of course connecting them to a T.E.N.S. device. The ultimate sensation!! ♥️♥️ As for their price, I consider it very reasonable at €3.00 per pair. If you find them more expensive, it would be excessive.
I wholeheartedly recommend them to everyone! Try them!