Rock-hard. ultra-sensitive nipples and heightened arousal are just a touch away. With the push of a button. Swell adheres perfectly to the skin with a strong automatic suction seal for hands-free funjust place the transparent cups over each nipple. power on. and watch them grow. Powerful multi-function vibrations with separate controls for each cup raise the intensity even higher. while simple controls make Swell incredible for solo or partner play. Individually-Controlled Vibrating Cups 7 Powerful Functions Powerful Auto-Pump Suction Air Release Button for Fast. Safe Removal Visually-Stimulating Clear Nipple Cups Phthalate-Free. Body-SafeDimensions:Width/Diameter: 2.25 in.