This pair of 1.75 inch long non-adjustable nipple suckers increases the flow of blood to your nipples when applied which causes enlargement and gives a pleasure/pain sensation that will last long in the memory. The thick, screw shaped silicone nipple suckers are smooth on the inside with a rounded lip that grips tight and hard. In order to get the best level of suction possible, apply a little water-based lubricant to the lips of the suckers before use. Available in Black.