Pumping is not just for men. The cylinder applies a vacuum to a focused area, immediately enlarging the clit, increasing blood flow and sensitivity. For those interested in clit enlargement, the pump can be removed, but the cylinder will stay vacuum-sealed on the clit, allowing prolonged wear in comfort. The clit is immediately more sensitive, and that the whole experience is erotic. Approximate opening of 0.875 inches in.; tube is 3.125 in. long; entire cylinder is 3.875 in. long. Pumps are sold separately.