Purdy 144400340 XL Series Swan Enamel/Wall Paint Brush, 4 inch Designed for use with all paints and stains This professional quality paint brush is fashioned with a blend of nylox (dyed nylon) and polyester filaments Highly recommended for both interior and exterior painting projects Hand-chiseled formulation for maximum paint lift and smooth "no-drag" application 4-inch brush Highly recommended for both interior and exterior painting projects The stiffness retention makes them especially high-performing for outside painting under hot and humid climate conditions Only solid, round, tapered Nylox (dyed nylon) and polyester filaments are used and our special tipping and flagging process brings our synthetic filaments as close to naturally flagged bristle as possible Hand-chiseled formulation for maximum paint lift and smooth "no-drag" application For varnish and enamel work