Product Description Angular Sash and trim brush. Satin-edge nylon and Orel polyester filaments. XL brushes are highly recommended for both interior and exterior painting projects with all paints. The stiffness retention of XL brushes makes them especially high-performing for outside painting under hot and humid climate conditions. Each XL brush style has its own unique hand chiseled formulation for maximum paint lift and smooth, no-drag application. Beavertail handle. The stiffness of the brushes makes them ideal for outdoor projects with different temperatures and humidity. A blend of Satin-Edge nylon (Tynex) and Orel polyester are used and our special tipping and flagging process simulates the ragged ends of natural bristle, so the brush holds more paint and releases it without brush marks. Each XL brush has a unique hand-chiseled formulation for maximum paint lift and smooth "no drag" application. From the Manufacturer Purdy's most popular brushes ... highly recommended for both interior and exterior painting projects and with all paints. The stiffness of the brushes makes them ideal for outdoor projects with different temperatures and humidity. A blend of Satin-Edge Nylon (Tynex) and Orel Polyester are used and our special tipping and flagging process simulates the ragged ends of natural bristle, so the brush holds more paint and releases it without brush marks. Each XL brush has a unique hand-chiseled formulation for maximum paint lift and smooth "no drag" application.