Ceramic and zirconia alumina blend is a self-sharpening grit that provides excellent performance and operation on stainless steel applications * Type 29 reversed saucer-shape, for aggressive stock removal * Full Y-weight polyester , resin bonding system with heavy-duty fiber backing for increased strength, durability, absorbs vibration and has good tear resistance * Durable fiberglass backing plate is lightweight, helps absorb vibration, and is high-strength * "Supersize" grinding aid provides a cooler cutting and faster cut rate