These 2-1/2 Inch X 60 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 and Cotton "X" weight backing on all other grits. These sanding belts feature a bi-directional butt joint for a consistent and smooth finish as well as extended belt life. This premium high performance abrasive is excellent for all purpose belt sanding - and specifically for use on Aluminum, Steel, Composite, Hardwood, and Softwood.