This set with two nipple suckers is specially made to make your nipples hard! These pistons increase the sensitivity of the nipples. They are easy to apply and will stay in place. They are also transparent so that the effect is clearly visible. You can use these nipple suckers not only on the nipples but also on other body parts, for example on the clitoris. The material is silicone and they are easy to clean with a toy cleaner. Use a little water-based lubricant for extra nipple adhesion.