Designed for powerful sucking action by pumping bulb. You control the action by pumping the bulb. The cylinder is 9 inches long and 2.75 inches wide. 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.