Use suction to make your shaft swell with sensitivity! Squeeze the hand pump and watch the needle move on the pressure gauge as your shaft is suctioned! Lube up and slide your cock into the cylinder - the optional sleeve around the base of the cylinder helps create a tight seal around your shaft. The foot-long hose leads to an industrial-style handle that is easy to operate. Just squeeze and pressure will build inside the cylinder, drawing blood flow into your dick for increased size, stiffness, and sensitivity. Once you're satisfied with your gains, use the pressure release valve to free yourself from the intense suction. Your cock has never been more fun to play with! Jack Mate Penis Pump specifications: Measurements: Cylinder is 9 inches in overall length, fits up to 8.5 inches, with a diameter opening of 2.15 inches. Hose is 10.3 inches in length. Material: TPR, silicone, ABS plastic Durable silicone hose Quick release valve Optional sleeve for cylinder opening