Wooster Ultra/Pro Extra-Firm Angle Sash Paint Brush, 2-1/2 In. an extra-firm blend with a strong touch, combining purple NylonPlus, a new generation of nylon filament, with purple and black nylon for performance. This brush is for all thick, heavy coatings such as exterior paints and maintains a sharp edge even in hot, humid conditions. It carries more paint to the wall and cleans up quickly when finished. The Lindbeck treated maple wood handle features a round rust-resistant steel ferrule, with a long and uniform thickness that allows painters to easily turn the brush and reach into corners.