By using the Nipple Suckers your nipples will expand to their fullest extent! The enlargement is temporary, but done on a regular basis it can result in some semi-permanent enlargement. The Nipple Suckers are made of the highest grade silicone and effectively suited for nipple play. The suction will create larger, perkier nipples causing a more than pleasurable sensation! Caution: Nipples are sensitive and over-pumping" them can be painful!