Those are 2×6 treated wood with a trim of 5/8″ off one side, then carpeted double on top, the second layer of carpet wraps the board. The front end is tapered about 20″ long with an additional 5/8 to zero for cosmetics on the trailer. The back end has a 45 degree chamfer across 3/4″ deep to reduce wear on the red corner. That should explain how, now the carpet is your decision though we do sell that.