ALUMINIUM OXIDE GRAINS WITH THE ADDITION OF REFRIGERANT FILLERS BOND TO EACH OTHER IN A PYRAMID SELF SHARPENING SHAPE, WITH A CONSISTENT HEIGHT THAT REMAINS CONSTANT DURING USAGE. THIS MAKES IT POSSIBLE TO REACH UNIFORM AND CONSISTENT FINISH IN A FEW STEPS, THE PERFECT PRODUCT FOR FINISHING. SUITED FOR ALL SORTS OF METAL SURFACES.