Straps on, Stays on! Real Skin 7 inches vibrating dong with 3 speeds and a sturdy suction cup base. This Universal Harness will fit any dong and is compatible with all Nasstoys Whoppers and Lifelikes. The adjustable straps guarantee a custom fit. Two ring sizes included to fit any girth dong. Materials Dong PVC, Remote ABS plastic, Harness Polyurethane PU, Rings Metal. Phthalates free RoHS compliant. Vibrator requires 3 AA batteries, not included.