Clinical studies have shown that vacuum erection devices will immediately give harder erections, cause temporary enlargement and increase permanent penis enlargement. According to the American Urological Society, these devices may also be useful in cases where such PDE5 drugs as Viagra have failed to work! Doctors see the penis pump as a safe, effective and cost-effective treatment for erectile dysfunction and state that prolonged use of these devices will increase penis size permanently. Other benefits of the PUMPED option include delayed ejaculation, improved sexual appetite, increased testosterone, maintained longer and harder erections, and support for peripheral tissue after prostate surgery. PUMPED, for immediate results! The trigger handle gives more power than the traditional pump. It will work to create a more efficient vacuum seal in less time, so you will need less pump energy to reach the desired hardness level. It is easier to maintain control of the amount of pressure in the cylinder and a cheaper option than a pistol grip pump. It also has a more comfortable grip than the ball mechanism, which means you can pump for longer. With a total cylinder length of 23 cm (9 ") and a diameter of 6 cm (2.35"), this high quality pump offers you ample opportunities for development in both directions! The total length of the tube is 25cm (10 ") and the inlet sleeve is made of smooth silicone. A silicone ring is a gift.