Premium Hard TriFold Tonneau Cover for 99-16 Ford F-250/F-350/F-450 Super Duty with 6.8ft Bed Double Sided, Tear Resistant - 24.5oz Marine Grade Black Vinyl material which is the highest standard in the industry. 6063 All Aluminum Sub Panels Comes completely assembled Scuff and Dent resistant hard fold design E-Z clamping system for securing your cover, providing tension and security to the cover.