Adam and Eve's Performance Pump from Evolved Novelties. For harder, thicker erections. Increase blood flow to your penis. Comfortable soft silicone insertion sleeve at the bottom of the base. Manual pull handle gives you full control. Ergonomic grip for precise handling. Sturdy crimp free air hose. Measure progress with measurements on tube. Clear tube made of hard plastic. Pump cylinder size 8.66 inches by 2.71 inches. Product comes with a 5 year warranty