The Deluxe Penis Pump with Nubbed Sleeve helps you get the most from your cock. Simply insert your penis into the cylinder, letting the internal suction sleeve create a tight seal, and squeeze the hand bulb to start pumping up! The full length, internal sleeve has raised nubs to provide additional stimulation during pumping. When you have the size you want, just press the release valve button above the bulb to break the vacuum, and remove your penis, swollen and ready to go! Use it to get an even bigger erection, or go for increased size over time with a regular pumping regimen. Measurements: 2.07 inch internal diameter, 8 inch cylinder length, 7.5 inch long flexible hose.