Made from a blend of glass and nylon, this hard material wheel is very strong, has good impact resistance, great rollability and is capable of taking high temperatures. Highly resistant to water, cooking oils, fats, petroleum based products, common cleaning solutions, solvents, acids and salt. Out last and out performs other wheels in high temperature applications. Very popular for use in bakeries, smoke houses, curing ovens, autoclaves, mobile powder coating racks, and other high temperature applications. Durometer: 85 +/- 5 Shore D. Temperature Range: -45 to +490 degrees / F continuous, +550 Degrees / F intermittent.