Platinum cured medical grade silicone. Ultra hygienic, non-porous and easy to clean. Can be boiled or placed on top rack of dishwasher. Flexible but firm graduated design. Smooth balls glides gently in and out. Two-finger handle for a simple, no slip grip. Silicone can be frozen for sexy chills or microwaved in 3 second intervals for hot thrills. Waterproof. Phthalate free