With these vibrating nipple suckers, you can achieve larger, more sensitive nipples and titillate them at the same time with vibration This set includes two suction cups with stimulating vibes, and a pump that creates a pleasurable vacuum sensation. Once in place, simply pump until you reach your desired size, then turn on the bullet vibes. The pump comes with a quick release valve to release the suction. Measurements: 31 inches in total length, distance between pumps is 9 inches. Material: TPR, ABS. Color: Purple. Note: Requires (6) tab batteries, not included