The Pyramid Nipple Amplifier Bulbs are an enticing technique to make your nipples fuller and more erect. Four graduated O rings are placed over the nipples in this enlarger system to keep them standing at attention! Simply place the desired size ring over the open end of the pump before using, place the glass pump over the nipple, and squeeze until the desired size is reached. Then, until it reaches the base, slide the stretchy rubber ring down over your engorged nipple. Two sizes of pumps are offered, allowing for a custom fit on any foot size.