Oso Grande's sharpening wheel kits consist of two (2) compressed paper wheels (different wheel diameter and width are available) that will fit on any bench grinder. One wheel is coated with Silicon Carbide and is used to develop a burr or wire-edge. The included Conditioning Grease (a special formula of fats, oils and waxes) is applied to the gritted wheel to lubricate and control heat. The second wheel is slotted and, with the help of the included jewelers rouge, is used to remove burrs and polish the edge. A grit wheel will sharpen a couple hundred knives before it needs recoating. Enough additional Silicon Carbide is provided with the kit to recoat the grit wheel about 30 times. Complete instructions are included in each kit.