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 suction cup base sticks firmly to any smooth surface. The nubs on the shaft will give exciting sensations while inserting.Diameter: 3.2 cm. Length: 13.5 cm.Wash with soap and water before and after each use.