Size Grit Maxrpm Type 1? Coarse,Medium,Very fine 30.000 R 1-1/2? Coarse,Medium,Very fine 30.000 R 2? Coarse.Medium.Very fine 30.000 R 3? Coarse,Medium,Veryfine 25.000 R Grit Size: Coarse Maroon Medium Red Very fine Blue Characteristics: manufactured containing a woven fabric (scrim) imbedded in the nylon structure of the non-woven fibers. Providing additional strength and durability for removing paints, rust, corrosion, exit burrs, weld splatter, parting lines and deburring on ferrous and nonferrous metals. Blending weld seams and deburring edges.