Nasstoys of NY Macho Collection Cock Sling Obvious for that epitome of stimulation. Simple to operate having a push button around the finish from the bullet vibrator. Hard 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 incorporated. Materials cock sling SEBS, bullet vibrator Abs plastic, fiberglass. Length 3 inches, Bullet vibrator 2.5 inches. One size fits most