Non-porous and hypoallergenic. Tapered for easy insertion. Suction cup base sticks firmly to any smooth surface. Waterproof.This nubbed plug is made of non-porous and hypoallergenic silicone, and has a tapered tip for easy insertion. The tip is slightly narrower than the shaft. Because of the suction cup base, the plug sticks firmly to any smooth surface. The nubs on the shaft will give exciting sensations while inserting.Diameter: 3.0 cm. Length: 13.5 cm. Wash with soap and water before and after each use.