With proper use you can enlarge and stimulate your nipples using our high tech vacuum pump. The pair of cylinders is crafted from industrial grade clear materials. Uses the same airlock release system as in our pumps. A dual T connecter is recommend to enlarge both nipples evenly and to insure constant pressure. Enjoy watching your nipples grow with proper use. Can be used to create great stimulation or punishment with higher pressure levels. We offer three sizes: S, M, L.