This is one of our best selling pumps, and with good reason! Whether you're looking to use it to extend the size of your penis, or simply to give yourself an erection at will, this professional-style pump is big enough to take 95% of men, and well built enough to keep you going for years! Simply rub a little lube or vaseline around the base of your penis to help make a seal, and then place the generous nine inch sleeve over your penis and use the hand bulb to remove the air slowly, until your penis is the desired size. The vacuum will pull blood into the penis, forming the biggest erection you've ever had! The Guardian also comes with a "Keeper" - a specially designed cock ring to place over the base of your shaft, which will restrict blood flow back into the penis, enabling you to keep and use your erection for up to four times as long!