A simple, effective pump made to be incredibly user friendly, especially for beginners, the Potent Developer is a great choice for any man looking to be his best self. The cylinder is transparent with a hint of smoky color, you'll be able to watch yourself grow, and you'll do so in comfort, thanks to a soft rubber donut sleeve that fits around the entrance, cushioning you and ensuring an airtight seal. To get things going, you simply need to place a finger over the air release opening on the side of the cylinder, and squeeze the bulb until the desired level of suction is reached. Total length is 7 1/2 inches.