ceramic bearings and plastic bearings with Corrosion and Oven-resistant Features, Available in Various Sizes Model Number:Full ceramic bearings and plastic bearingsMaterials: ZrO2, Si3N4, SiC and Al2O3 Oven-resistant and wearable Can be used in extreme badly environment High speed bearings: 12,000 and 75,000rpm High-temperature-resistant bearings: 100 to 800 degrees Celsius Can be applied in kiln, plastic, steel and other equipments that can bear high temperature Corrosion-resistant bearings Electric-insulated bearings Vacuum bearings: self-lubricating without oil