With a total cylinder length of 23 cm (9") and an inner diameter of 5.5 cm (2.17"), this high-quality pump gives you ample possibilities to grow in both directions! The total length of the hose is 25 cm (10") and the insertion sleeve is made of smooth Silicone. Surprise yourself on how big you can get! This variant comes with a plastic pistol grip pump, a cylinder with gauge and a quick release valve for your comfort. There are two versions available: transparent and black. Clinical studies have proven that vacuum erection devices will give instantly harder erections, cause temporary flaccid enlargement and can increase permanent penis augmentation. According to the American Urological Association, these devices may also be useful in cases where such PDE5 drugs as Viagra have failed to work! Doctors view the penis pump as a safe, effectual and cost effective treatment for erectile dysfunction and state that the prolonged use of these devices will enhance the size of the penis permanently. Other advantages of the PUMPED selection are, amongst others, delayed ejaculation, improvement of sexual appetite, boosting of testosterone, the maintenance of longer and harder erections and the supporting of penile tissue after prostate surgery. PUMPED, for instant results! WARNING: Please read product manual before using any type of vacuum pump or constriction ring. Stop using the devices immediately if you experience any pain or discomfort.