3M Utility cloth roll, 1in w x 50 yd, Aluminum oxide, 240 grit the desired length of the strip can be torn from the roll for a specific application. Most grades have a light, J-weight cloth backing that proides the flexibility needed to conform to circular edges, Angles, or other contours. Rolls in grades p50 or p60 have a slightly stiffer x-weight backing suitable for more coarse sanding applications. Cloth remains durable even when bent or rolled, without tearing or shelling, But strips can be torn by hand when a smaller piece is needed, without comproising the sanding surface. aluminum oxide is a popular choice among industrial proessionals because of its fast cut-rate and long life. This mineral makes a tough, Durable abrasive that self-fractures to expose fresh cutting edges, whereas traditional natural abrasives dull more quickly. Aluminum oxide is suitable for a wide variety of materials in both woodworking and metalworking, Including ferrous alloys. aluminum oxide abrasive can be used on ferrous and non-ferrous metals, wood, And plastic. applications: cleaning, Contour finishing, Deburring, rust removal