This 550 lb capacity 2 1/2 inch width x 10-inch diameter centred pneumatic black wheel features a 3/4 inch bore, ball bearing, and a durometer rating of 80A. It's also puncture-proof and impact-resistant. The Duraflex solid cushion tire is a blend of granular rubber & chemical accelerators, mounted on a polypropylene centre, and cured under extreme pressure.