The curved base has embedded 2mm inputs that allow you to sit on. rock and grind against the silicone e-stim butt plug during wear. Designed with a tapered shape to assist insertion and a ridged texture to enhance sensation during wear. Seamless bipolar contacts in the shaft transmit sensation from an ElectraStim stimulator (not included). making the anal pleasure zones tingle and the muscles pleasurably throb in time with the stimulation pattern. Measures 4.1 in. long insertable. 1.2 in. diameter. 3.7 in. circumference at the widest point.