This is not your ordinary cock ring or plug Featuring a stretchy yet snug cock ring to enhance size and staying power, this Prostate Plug with Cock Ring and Vibrating Stimulator also boasts a contoured prostate stimulator as well as a separate vibrating perineum stimulator. Simply insert a bullet vibrator into the stimulator opening and turn on to experience maximum stimulation three different ways Measurements Prostate stimulator is approx. 4.5 inches in length and 4.25 inches in circumference at widest point. Perineum stimulator approx. 1 inch long and 3 inches in circumference. Cock ring opening is approx. 1.625 inches, allow for stretch. Bullet Not included