The accessory strap kit provides a replacement set of cam straps (Centerpoint and Left/Right lateral straps). The kit comes in a zippered mesh nylon bag for easy storage of the straps when the rack is not in use. The 4' Centerpoint cam strap has a back pad made to cover the counterpoint sleeve.  The Left/Right lateral straps have sewn-in metal cam buckles and two vinyl coated steel S-hooks for whatever load or extra configuration you may need. The three straps in the kit are each 1" wide, black, heavyweight polypropylene webbing rated for 675 lbs.