Nasstoys of NY Macho Collection Vibrating Cock Sling Blue for the ultimate in stimulation. Easy to operate with a push button on the end of the bullet vibrator. Harder thicker erections. Ultimate clitoris teaser stimulation. Super stretchy. Push button operation. Waterproof vibrations. Phthalates free, RoHS compliant silicone. Vibrating sling requires 3 LR44 (AG13) batteries included. Materials cock sling SEBS, bullet vibrator ABS plastic. Length 3 inches, Bullet vibrator 2.5 inches. One size fits most.