A 2 1/2 inch width x 10-inch diameter centred pneumatic black wheel with a 5/8 inch bore and ball bearing. With a 550 lb load rating, the Duraflex solid cushion tire is made from a blend of granular rubber & chemical accelerators, mounted on a polypropylene centre, and cured under pressure. It is impact-resistant and puncture-proof. The durometer rating is 80A.