The Retrax One is the easiest to use and most versatile retractable truck bed cover on the market. Sealed ball bearing design assures the Retrax opens and closes easily without the use of pull straps and springs... And the Retrax locks in any position from full open to fully closed to accommodate any load you may haul. And the Retrax is strong and good looking. The rolling cover is made of tough weather resistant polycarbonate with tempered aluminum support beams embedded within the polycarbonate sheet to add strength and assure a quiet ride at any speed. It has a streamlined design with a front cover that is flush with the rolling cover and has automotive grade weather stripping to seal and keep your truck bed dry. Matte black finish makes every truck look great. Made in America. One of our very best sellers because this truck cover delivers the most wanted features at an affordable price! Installation available at an additional $80 charge.