These abrasives are comprised of high quality silicon-carbide grains and are ideal for fine sanding when staining or oiling hardwood floors. Bona 6" Black Abrasive Discs are best used as "finishing" abrasives, as they provide the best color when staining and oiling. The high quality silicon-carbide abrasive grains continually break-down into fine cutting points, giving you the best surface quality for natural, stained and oiled floors." High quality silicon-carbide abrasive grains. Consistent cut for best surface quality. Ideal for fine sanding
