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3M Cubitron II coated 982C fibre disc uses ceramic aluminum oxide as the abrasive material and has a diameter of 7 in. 3M incorporates this ceramic aluminum oxide material into the fibre disc forming a grit of 60. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This 3M fibre disc can be run at a maximum speed of 8600 RPMs.