Dico 541-788-4 Nyalox Flap Brush 4-Inch Blue 240 Grit Maintains shape Will not rust Abrasive grit infused in every bristle Last up to (10) times longer that Wire Brushes Convenient Shapes and Sizes for all jobs Gray-Extra CoarseOrange-Coarse and Blue-Fine Will not rust & maintains its shape. Safer to use. For light sanding and cleaning of unfinished and rough woods