The Optimum Series Maximum Results Pump Set includes 2 powerful suction pumps, a detachable hose and a single-handed Master Grip pump handle to deliver maximum results with every pump session. With every squeeze of the Master-Grip single-handed pump, you can look forward to powerful girth and length increase. To give you all the space you need to grow, each kit includes a large and a X-large pump cylinders with quick air release levers. The soft, flexible air hose makes it each to switch pump cylinders, but is designed to maintain air pressure even when the hose is removed. To reduce or remove pressure, simple press the air release level on the tip.