The RetraxONE MX retractable truck bed cover is part our Polycarbonate Series covers. The RetraxONE MX has a sealed ball-bearing roller system that glides effortlessly along the rail with the convenient handle that eliminates the need for pull straps, Velcro, snaps or springs. The RetraxONE MX is key lockable any position that gives you unlimited flexibility in your hauling capacity.