Designed to fit over the nipples one at a time and pump your nipples erect so they become more sensitive we have this fabulous Glass Nipple Pump, a superb small suction pump that will quickly tease your bugs into full arousal. The superb Glass Nipple Pump has been manufactured in clear glass with a flared mouth and black bulb pump, and all you do is place the mouth over a nipple and squeeze the bulb pump to form a vacuum that sucks the nipple erect.