The ElectraStim Rocker Butt Plug has been designed for truly hands-free use. The unique curved Rocker bases feature embedded 2mm inputs that allow you to sit on, rock and grind against the e-stim butt plug during wear. Designed with a tapered shape to assist insertion and a ridged texture to enhance sensation during wear. Seamless bi-polar contacts in the shaft transmit sensation from an ElectraStim stimulator, making the anal pleasure zones tingle and the muscles pleasurably throb in time with the stimulation pattern. Made from 100% platinum-cured, medical-grade silicone, the designs are free from phthalates and body safe.ElectraStim stimulators sold separately. 4.1 inches insertable length x 3.7 inches circumference at the widest point (1.2? diameter)