3" x-firm brush. These brushes feature an extra-firm blend with a strong touch. Made with a combination of purple NylonPlus (a new generation of nylon filament) and purple and black nylon. They provide unbeatable performance wherever a stiffer brush is needed. Great for all thick, heavy coatings such as exterior paints. Maintains a sharp edge - even in hot, humid conditions. Carries more paint to the wall and cleans up fast when done. The Lindbeck treated maple wood handle has a round rust-resistant steel ferrule. Its long and uniform thickness allows the painter to easily turn the brush and reach into corners.