Adds 3 inches to length. 30% Xtra girth. Vibrating. Better than Real “REALSKIN”.Waterproof. Materials: Sleeve - TPE, Bullet Vibe - ABS. Size: Sleeve Size: Length - 6.375?, Diameter - 1.5325?, Bullet Vibe: Diameter - 0.6825? X 2.25?. Uses 1 LR 44 (AG13). Batteries included.