The uniquely curved rocker bases feature recessed 2-mm inputs that allow for rocking and rubbing while wearing the E-Stim anal plug. The conical design facilitates insertion, and the ridged surface enhances the sensation during wear. The seamlessly embedded bipolar contacts in the shaft transmit stimulation from the ElectraStim stimulator, causing the anal erogenous zones to tingle and the muscles to contract pleasantly in rhythm with the stimulation pattern. Rocker Butt Plugs are available in small, medium, and large sizes, making them a perfect addition for fans of the Aura, Nona, and Sirius electrodes who crave a thicker, fuller, and more dynamic feeling during electrical anal play. ElectraStim stimulators are sold separately.