Gold nylon/sable polyester. Stiff formulation, substantial feel, walnut-finished wood handle. Round steel ferrule, chisel trim. Wooster Super/Pro brushes offer powerful performance anyplace under the sun. Made with the finest-quality sable polyester and gold nylon filament, Super/Pro has just the right amount of stiffness and flex for applying all heavy-bodied paints. The durable formulation easily withstands humidity and heat, so Super/Pro is a stellar choice for outdoor work and indoor work, too.