The 2Sand Blue/Green Zirconia belts are the ideal belts when working with all metals. Perfect for heavy stock removal. They are made with a rugged synthetic abrasive (Zirconia Alumina) that is self sharpening as you go to allow for a longer belt life. They can usually last up to 5 times longer then aluminum oxide belts. We offer the Zirconia belts in singles for grits: 36, 60 and 120.