Commander Beginners Vibrating Butt Plug. Powerful vibration. Soft for easy entry. Expands after entry. Push button suction cup. Removable bullet. Waterproof vibrations. Materials Butt plug 100% silicone, Bullet vibrator ABS plastic. Size length 4.5 inches, width 2.25 inches, circumference 4.125 inches. Bullet vibrator requires 1 AAA battery, not included.