Throb your knob with this power thrusting head stroker! 2 powerful speeds of super stroking action. Removable textured super stretchy sleeve. Easy to clean. Easy to operate with EZ sliding speed control. LED indicator light. Handy grip strap for secure use. Stroker is made using phthalate free, non-toxic materials ABS plastic case, switch, decor ring, strap, Thermoplastic Resin TPR sleeve, Polyester elastic strap. Vibrating masturbation device requires 4 AA batteries, not included. Chamber measures 3 inches long by 2.25 inches wide. Overall measurements 7.75 inches long by 2.75 inches wide.