Features. Cubitron II Fiber Discs are made with revolutionary 3M precision-shaped ceramic grain technology engineered with ultra-sharp fast-cutting points that wear evenly run cool and optimize mineral breakdown to maximize disc life.. Start with Cubitron II fiber discs for heavy stock removal and use the same toolaccessories to quickly change over to Scotch-Brite light grinding and blending discs for your finishing needsSpecification. Diameter - 7 in.. Arbor Thread - TPI or Pitch - Quick Change. Grit - 36. Speed - 8600 rpm Max. Color - Brown. Abrasive Trade Name - Cubitron. Roughness Grade - 36. Abrasive Material - Precision Shaped Ceramic Grain.. Body Material - Fiber. Mounting - GL. Item Weight - 0.18 lbs.