Mister B8 Lip Service Vibrating Mouth Pack. Waterproof bullet adds vibration. Realistic look and reusable. 6 inch sleeve, tight textured tunnel. Super stretchy to fit any man. Easy to use and easy to clean. 100% silicone C-ring set. 1.8 inch, 2.2 inch and 2.4 inch standard ring sizes. Phthalate fee and body safe. Uses 1 AAA battery , not included.