The best part of pumping is making your nipples bigger and more sensitive. Alas, when vacuum cylinders are removed the nipples remain big and long for maybe 15 minutes. They stay sensitive and excitable for hours but not big. We wanted nipples that stayed big, hard and even more excitable for hours and our solution was the NippleWraps™. They are easy to apply after enlarging the nipples and super easy to take off when becoming uncomfortable. How you use your big hard nipples is left to your imagination. ENJOY!!