Made from durable 6063 aircraft quality tubing. Exclusive slow motion folding center hinge with replaceable rubber bushing. Welded non-slip aluminum center rungs. Replaceable rubber feet. Angled bottom for smooth wheel transition. Extra-strong tongue with rubber under-pad. Aircraft-quality tig-welded construction. Customizable tongue graphics. A9 ramp measures 9' (274cm) long, 10.5 (26.7cm) wide inside rails or 11in. (28cm) outside edge-to-edge; weight capacity of 600 lb. (272kg). A8 ramp measures 8' (244cm) long, 9.5 wide (inside rails) or 11in. (28cm) outside edge-to-edge; weight capacity 550 lb. (250kg).