This suction cup is high quality and sticks incredibly well to any smooth, non-porous surface!

Tip: Applying a small amount of oil, lube, etc. on the underside of suction cup will greatly improve performance and longevity of suction during play. Apply the suction cup to the surface first before attaching the toy. Press suction cup down hard onto non-porous surface until it sticks and remains attached to surface, then insert toy onto prong. Always apply a small amount of oil, lube, etc. to prong prior to inserting into toy to prevent splitting and chipping around the toy's attachment hole. Use care when inserting and removing prong from toy to avoid damage to toy's attachment hole.