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product description - Medical ABS tube, anti-drop and anti-crack - Manual suction cup, easy to operate. - Accurate scale, feel the added effect accurately - Manual power supply - Deluxe Package (with Airbag). How Pumping Works Pumping increases blood flow to the penis area, which stimulates a firmer, longer-lasting erection. Suction also increases sensitivity, aids in endurance training and temporarily enlarges the size of the penis. A 10-minute session can thicken and lengthen your penis for up to 24 hours, and regular use can achieve permanent results.