Optimum Series Rechargeable Executive Automatic Smart PumpColossal cylinder standing at 10. 5b 46. 75 cm for bigger and better results Sleek and durable automatic pump with superior suction at the push of a button 3 unique exercise modes designed to build your endurance, or use constant suction feature Ridged stroker sleeve is removable for independent use and is designed to fit most pump cylinders Ultra thick chamber sleeve for magnified results Quick air release button Clear cylinder with incremental