Vaginal cylinder is hand crafted of industrial strength crystal clear acrylics. Through a strong vacuum, the cylinder can increase the amount of blood in the vaginal area. Tapered toward the top to match the natural shape and for maximum comfort. Includes a quick connect/disconnect safety valve that maintains the vacuum after you disconnect the pump. Medium size (3.75 in. by 4.75 in.) Does not include a hand pump or hose, sold separately.