Specifications:
Bullet Length: 1.25" 
Width (at widest point): 2" 
Ring Interior Diameter (at widest point): 1.5"
Material: Silicone/ elastomer blend (SEBS)
Compatible Lubricants: Water-based lubricants 
Waterproof: Yes 
Power: batteries included (ring is disposable, use time approximately 30+ minutes)