These flap discs are manufactured using the latest development in abrasive technology in the metalworking industry. Ceramic Flap Discs do exceptionally well, outperforming Zirconia flap discs by up to 50% on stainless steel, carbon steel alloys and exotic metals. Ceramic grains are self-sharpening, remaining sharp throughout the entire life of the wheel. In addition, all discs are manufactured on computer controlled machines and subject to numerous tests which ensure high quality and greater safety.