Get ready to pump it up for bigger. longer erections with The SMP Beginner Pump. Perfect for those just starting out. This pump gives you all you need to be large and in charge! By creating a tight vacuum seal around the penis. it will cause suction as well as additional mass temporarily. The pump as a quick air release control. pneumatic bulb. latex ring for a tight seal. and a see-through cylinder to monitor the results. With a soft sleeve. easy squeeze pump. and a flexible hose. you will have no trouble getting your pump on!Measurements: Approximately 20.3 cm in length. 19 cm for penis. circumferences of 17.8 cm (tip) to 18.4 cm (base) and opening of 5 cm in diameter.Material: ABS plastic. latex