Noduled suction tunnel for the real feel. Better than Real "Real Skin".Waterproof Separate compartment for vibrating bullet Materials: Masturbator - TPE, Bullet - ABS 3 LR44 (AG13) batteries Masturbator: Length - 6", Width - 3", Height - 3.5" Vibrating Bullet Size: Length - 2.25", Diameter - .75"