3 sizes: 2 insertable inches (5 cm), 2.5 insertable inches (6.3 cm), 3 insertable inches (7.6 cm.) Silicone is non-porous and ultra hygienic. Silicone is easy to clean; boil it or place it on the top rack of the dishwasher. Silicone can be submerged in hot or cold water for different sensations.Waterproof. Phthalate free.