The low temperature rating
Wall mount 7 gauge steel construction
Tread & Core: Glass-Filled Nylon This caster is listed with wheel diameter 5"
The product details list Self-Healing Thermoplastic Rubber for the wheel/tread
Protecting pallet rack ends and uprights
8" x 2" Polyon Cast Swivel Caster w/ Total Lock Brake - 1250 lbs. Cap. Appliance/Vending Machine Trucks The low temperature ratingProduct Overview Polyurethane elastomer tread chemically bonded to a cast iron core. These wheels are somewhat heavy and are ideal for warehouses with concrete and hardwood flooring. Tread: Polyurethane Elastomer This caster is listed with wheel diameter 8", tread width 2", load capacity 1,500 Lbs., tread type Polyurethane Elastomer, and bearing type Roller Bearing. Before ordering, verify the listed wheel dimensions, load capacity, bore or bearing,