Echo's phallic head is multiplied all the way down the shaft. for constant g-spot pleasure or to resist against. using the protrusions to exercise your PC muscles. Single Speed Removable Waterproof Bullet Vibe. Uses 1 x 1.5 NV Type Battery. Made from Tantus* own unique formula of 100% Ultra-Premium Silicone. Eco-Friendly. Hypoallergenic. Hygienic. Boilable. Bleachable and Dishwasher Safe.