Nipple Amplifier Enlargement Bulbs With O RingsThe Pyramid Nipple Amplifier Bulbs are an erotic way to have fuller, more erect nipples. This enlarger system has four graduated O rings to place over the nipples to keep them standing at attention! Simply slip the desired size ring over the open end of the pump prior to use, fit the glass pump over the nipple, and squeeze until you reach your perfect size. Then slide the stretchy rubber ring down over your engorged nipple, until it reaches the base.