2-1/2" x 48" Industrial Quality sanding belts made from a Zirconia blend grain in 100 grit Zirconia abrasive grain features Poly Cotton "X" weight backing Sanding belts feature a bi-directional butt joint for a consistent and smooth finish as well as extended sanding belt life This Zirconia and Aluminum Oxide blend provide faster cutting and longer life Excellent for all purpose belt sanding and specifically for use on aluminum, steel, composite and hardwood These 2-1/2 Inch X 48 Inch cloth sanding belts are made with premium German engineered Starcke material. All our sanding belts are made custom to order in grits 24 - 120. This Zirconia abrasive grain features Poly Cotton "X" weight backing. These sanding belts feature a bi-directional butt joint for a consistent and smooth finish as well as extended belt life. A full resin bond allows for long lasting performance. This high performance abrasive belt is excellent for carbon steel and hardwood.