This premium prostate exercising tool is ideal for anal massage and stimulation. Contoured to curve with the male anatomy perfect so it massages the prostate and the perineum simultaneously, while 6 modes of rhythmic vibration will send him over the edge. Once inserted, the Cobra will move with every thrust for maximum pleasure. Made of premium silicone, so it is non-porous and easily cleaned. Measures 4.75 in. long, 3.5 in. insertable, 0.85 in. dieameter. Requires 2 AA batteries, not included.