3M Cubitron mineral, resin bonded to a rugged fibre backing, gives this disc performance levels which extend the limits of grinding technology. With a grade and size of disc to suit every application and all commonly used grinders and grinderettes. The advanced new mineral formulation of the Cubitron 988C HP Fibre Disc has greatly increased cutting power, making light work of heavy duty jobs like door skin removal, flange and MIG weld grinding.