This 500 lb capacity centred pneumatic black wheel has a 2 1/4 inch width, an 8-inch diameter, a 5/8 inch bore, and a ball bearing. It is puncture-proof and resistant to high impacts, with a durometer rating of 80A. The Duraflex granular rubber is moulded over polypropylene which has been cured under tremendous pressure, making it strong and long-lasting.