Size Matters Nipple Enlarger Kit contains everything you need to enhance your nipples. With proper use you can enlarge and stimulate your nipples using the Nipple Enlarger Kit. It Utilizes the same concept as traditional penis pumps, which have been effective in enlarging penis size. The cylinders are crafted from industrial grade clear acrylic. The vacuum lock release system allows the nipple cylinders to stay on without the pump. Use the dual T connector to enlarge both nipples evenly and to insure constant pressure. Kit includes: two ABS plastic nipple cylinders, T connector and Deluxe ABS plastic hand pump. Category: Size Matters, Enlargement Gear, Nipple Toys. The nipple cylinder is 1 inch in diameter.