<p>Calibrated measure up pump with high capacity vacuum stainless steel release valve, flexible hose and three different sized rubber rings.</p> <p>Some men swear by the use of pumps as effective tools for increasing size, while others think pumps have no lasting effect. Pumps can extend length while using, but the question is, will the penis return to original size after using? Unfortunately we do not have that answer and can not guarantee or be responsible for any results.</p>