Rock-hard, ultra-sensitive nipples and heightended 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 fun - just place the transparent cups over each nipple , power on, and watch them grow. Powerful multi-function vibrations. 

Individually-Controlled Vibrating Cups 
7 Powerful Functions 
Powerful Auto-Pump Suction 
Air Release Button for Fast, Safe Rmoval 
Visually Stimulating Clear Nipple Cups 
Phthalate-Free, Body-Safe 

MEASUREMENTS: 
Nipple cup diameter: 2.25 inch (5.72 cm)