It is silicon layered PVC heavy anal plug with double beads. It can be used for anal pleasure or strengthening anal muscles. When used by the user, the small bouncy metal ball inside the plug hits the inner walls of product to generate the force and to enhance contractibility of the anal muscles. It is 12.5cm long with 3.5cm of bottom bead paired with 2.8cm of top bead. It has an easy grip to help support insertion process.