The latest generation NorZon (zirconia alumina) outperforms competitive zirconia by 20 percent NorZon (zirconia alumina) outperforms aluminum oxide by up to 10X on difficult to cut metals High-performance resin bond designed for free cut and long life Broad utility from light-to heavy-pressure applications, on a wide range of materials; Excellent performance-to-price ratio for lower total grinding costs Made in the USA