Kovax P120 125mm Maxcut Sp Tack Abrasive Discs 7 Hole - 50 per Box

These discs have hardened aluminium oxide grains, which score on the Mohs hardness scale is 9.8 (for comparison, diamond, which is the hardest mineral, has a score of 10). This makes them perfect for very tough sanding. Clogging is avoided due to the open embankment structure.