These Premium Zirconia belts are fabricated from Starcke 341X material. Premium 100% blue Alumina Zirconia grain for operations where a high stock removal is required. Although it is engineered for use on stainless steel, you will appreciate its strong backing, tough grain and long life. Suitable for sanding wood floors, hardwoods, aluminum, other metals, rubber and leather. Industrial quality abrasive belts made in Germany.