The Nipple Bulb is a gentle little suction device for enhancing and raising your nipples. Just apply to the nipple and squeeze for light&#44; comfortable suction. To use the erection O rings&#44; slip on the vacuum tube before suction begins. Then&#44; slide off tube onto the erect nipple. It has a two inch suction bulb for gentle&#44; pleasing pleasure&#44; a clear tapered vacuum tube for comfort and comes complete with 4 nipple erection rings. <ul> <li>Vacuum bulb with 4 nipple erection rings</li> <li>ABS (nozzle) PVC (bulb&#44; rings)</li> <li>.4&rdquo;/1 cm (tip diameter)</li> </ul>