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. Diameter: 1.55"Insertable Length: 6.5"