The Wide Body Thickwalled Cylinder has a wall measuring 1/2 mm thick. The thicker wall is easier to maneuver and creates a stronger seal so no base is needed at the end of the pump. With no thick base at the end of the pump there is less pressure on the pelvic bone. It’s an elliptical / oval shaped penis cylinder that’s designed to focus on thickness as well as length. This penis pump cylinder is 9 inches in length and comes with multiple diameter options.