Ceramic Grains (Ceramic Alumina Abrasive)are kinds of sintered abrasive uniformly produced by a controlled chemical sol-gel (also be called"Seeded Sol Gel")process to provide optimal strength and consistent properties. They are made in a way which creates thousands of fracture points throughout, ensuring consistent breakdown and life.The characteristic crystalline structure of ceramic grains provides numerous cutting points within each grain. Contact pressure will fracture weakened cutting points and expose fresh grain surfaces, effectively “self-sharpening” during use.