Clinical studies have proven that vacuum erection devices will give instantly harder erections, cause temporary flacid enlargement and can increase permanent penis augmentation. 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. The hand held pump has a quick release valve for your comfort. Dimensions: 18.7 x 4.92 x 3.35 in. Total Cylinder Length: 13.4 in. Inner Diameter: 3.15 in.