Natural, fluted handle. Round edge, stainless steel ferrule. Nylon filament bristles. Professional quality paint brushes fashioned with a blend of nylox (dyed nylon) and polyester filaments. Only solid, round, tapered filaments are used in these brushes. Filaments are tipped and flagged by a special process to make them as close to naturally flagged bristles as possible. XL brushes are recommended for both interior and exterior painting with all paints. The stiffness retention from the polyester content makes these brushes highly effective for exterior painting in hot and humid conditions.