Silicon Carbide is considered the industry standard for sharpening belts. Our industrial grade 1X42 Sanding & Sharpening Belts are made from the material used in larger applications. You get professional quality sharpening results with our professional quality 1x42 sharpening belts. Silicon carbide offers a fast and efficient cut. This means silicon carbide will do more work in less time. Avoiding excessive prolonged heating while sharpening. Silicon Carbide grain sharpening belts will also keep a more consistent cut than aluminum oxide. A 220 grit silicon carbide sharpening belt will maintain it's 220 grit cutting power until the material is depleted. Cleaning your sharpening belts will help achieve this extended cutting power.