CalExotics Nipple Play Vacuum Twist Suckers in Pink CE-2645-10-2. Providing intensely stimulating suction targeted to particularly sensitive bits of flesh, nipple play's Vacuum Twist Suckers are ideal for advanced nipple play, and can be enjoyed elsewhere just as effectively. Large and sturdy, the Suckers feature a wide circular opening to fully surround the nipples, clitoris and more. Press the Sucker against the skin to create a seal, and twist the black cap clockwise to activate suction- an internal plunger will rise, drawing air (and flesh) up through the cylinder as it goes. Twist the cap in the opposite direction to release internal pressure. In a firm, hygienic ABS plastic, the Suckers set cleans easily using warm soapy water or a good toy care fluid/foam. *Each Sucker is approximately 4" (10.2cm) long with an opening of 1.1" (2.8cm) in diameter.