New Dri-Plane bearings are produced to the exact standards of our SAE 841 powdered metal bearings, however, they have a graphite-based dry lubricant built right into the walls of the bearings. There is NO OIL or GREASE needed for lubrication, therefore, cleaner with no out gassing, and can operate in temperatures -30F to +700F. They are ideal for furnace and oven applications. Also food processing and electrical equipment, exercise equipment, pharmaceuticals, vacuum processes, and glass manufacturing to name just a few.