GatorTrax Retractable MX Tonneau Truck Bed Cover 2015-2018 Ford F150 6.5 ft Bed Fits Only - GatorTrax Retractable MX Tonneau Truck Bed Cover 2015-2018 Ford F150 6.5 ft Bed GatorTrax MX slides back and forth by hand on sealed ball bearings. It can also be key locked in any position. Made out of heavy duty aluminum that will support 500 lbs Sealed Ball Bearings require Zero Maintenance and will never freeze. Made in the USA - Limited Lifetime Warranty