Weiler 22603 Burr-Rx 7Mm-Dia Power Tube Brush, .026/120Cg Crimped Fill, 1" Brush Length, 3-1/2" Overall Length Crimped Black Ceramic Filament - Burr-Rx Ceramic (CG) is an engineered abrasive grain that produces a superior cutting action and is compatible with the widest range of materials. It is the most effective grain available today. Abrasive brush filaments are manufactured by extruding a mixture of liquefied polymer and abrasive grain. Unlike the filaments used in DIY grade abrasive brushes, industrial grade products like Weiler’s Nylox® and Burr-Rx® brushes feature the highest grade of abrasive filament manufactured using a Type 6.12 nylon polymer. Industrial grade filaments also feature the highest quality abrasive materials that have been sifted and sorted to ensure that the grains are consistent in size. Nylox brushes containing the Burr-Rx black ceramic filament provide the following advantages over SiC and AO filaments : 400% greater cutting action, most cost-effective deburring brush, deburr tougher materials, minimize cycle time, maximize tool life, reduce finishing costs, and eliminate hand deburring.