Endorsed and prescribed by Dr. Joel Kaplan, this pump features robotic vertical suction action as well as intense multi-speed vibrations. The thick plastic cylinder has a stretchy donut sleeve entrance that is shaped like a mouth and a silicone sleeve that is lined with raised nubs for stimulation during stroking. Suction bulb attachment increases the pressure within the transparent vacuum tube for greater blood flow. 5.5�x 1.5�/14 cm x 4 cm (sleeve.) 2.25�/6 cm (cylinder diameter.) 8� x 1.5�/20 cm x 4 cm (cylinder.)