Description: Coloring tumbling abrasive. Porcelain, ideal for burnishing or accelerated chemical deburring. An extremely heavy, high density, durable media that can replace steel media for burnishing. Icreased weight decreases time cycle in in acid process deburring and all tumbling operations. Principally used in burnishing applications, can also be used for light burr removal, radius formation, and is an effective driver for loose abrasives in cut and color operations. A3’s hardness, toughness and fine crystalline structure make it one of the best products available for developing lustrous, high color burnish on all types of ferrous metals, brass, and aluminum. Porcelain (140 lbs./cubic ft.)