These 2-1/4 Inch X 80 Inch cloth sanding belts are made with premium German engineered Starcke material. All our sanding belts are made custom to order in grits 24 - 400. This Aluminum Oxide abrasive grain features Poly "Y" weight back on coarser grits (24-80) and Cotton "X" weight backing on all other grits (100-400). These sanding belts feature a butt joint for a consistent and smooth finish and extended belt life. This premium high performance abrasive is excellent for all purpose sanding - and specifically for use on Aluminum, Steel, Composite, Hardwood, and Softwood.