I pumped at high/low pressure on a marathon exercise just to see what I was capable of reaching,I have pumped for some years so my body is used to developing.I had been taking some suppliments too,and noticed my libido had sky rocketed.I had also made my own cock tubes The largest sucked in my balls too,The openning is 4.5" the ball chamber area balloons out to 10" diameter for 3" then tapers down to 5" diameter and 10" long. After 3 days I was packing the tube completly I got carried away and made a monster tube and pumped for a day a night and half the next day wow what a cock.I was 16" long x 6" diameter my girlfriend turned into a nympho then accused me of being an addict to pumping and wants me to show here friends they all know and have seen the bulge, life is soooooooo goooooood !!!!!!!!!!! results last for 8 days and I get a little permanent gain each time I pump.