Constructed from a one-piece sheet of polycarbonate MX covers are given a rugged and durable matte powdercoat finish Patented low-profile design incorporates a front cover that is flush with the truck bed cover Clamp-on bed cover can be installed by anyone with basic hand tools Sealed ball-bearing rollers mounted onto the aluminum support beams allow the RetraxONE MX truck bed Constructed from a one-piece sheet of polycarbonate; MX covers are given a rugged and durable matte powdercoat finish; Patented low-profile design incorporates a front cover that is flush with the truck bed cover; Clamp-on bed cover can be installed by anyone with basic hand tools; Sealed ball-bearing rollers mounted onto the aluminum support beams allow the RetraxONE MX truck bed