Feel the excitement of penetration again and again with this *self penetrating butt plug*! A new and unique concept will take anal pleasure to a whole new level! The *secret* of this exhilarating butt plug lies inside its very smart construction. A hidden tube contains 2 heavy balls that will shift up and down during your movement(s) causing extra anal stimulation like you*re getting penetrated over and over again! This Black Beauty is totally waterproof and made of smooth. phthalate free medical-grade silicone. It stands 12.7cm (5inch) tall and has a maximum girth of 3.6cm (1.42inch) with a *stop* measuring 5.65cm (2.23inch) in diameter. Dimensions package 7.2 x 4.06 x 4.06 Weight package 6.42 oz Product dimensions 4.92 x 1.42 Product weight 3.53 oz Product diameter 1.42 Waterproof Yes Splashproof Yes Phthalate free Yes Materials Silicone