The Nipple Bulb is a gentle little suction device for enhancing and raising your nipples. Just apply to the nipple and squeeze for light, comfortable suction. To use the erection "O" rings, slip on the vacuum tube before suction begins. Then, slide off tube onto the erect nipple. It has a two inch suction bulb for gentle, pleasing pleasure, a clear tapered vacuum tube for comfort and comes complete with 4 nipple erection rings.