Phenolic resin mixed with macerated canvas; creates a high capacity, high impact resistant wheel that has many years of proven reliability in the industry. 10"x2-1/2" Phenolic Wheel with a 3/4" Roller Bearing & a 1/2" ID spanner bushing. Hard tread rolls easily, provides good concrete floor protection and is quieter than steel wheels. Resistant to oil, grease & solvents, non-metallic & non-sparking. Economically priced wheel. Zerk fitting are not standard, but available upon request. Durometer: 90 Shore D (+/-5). Temperature range: -50° F to 250° F