Purdy's XL series is the most versatile brush series. Designed for use with all paints and stains. The XL series has a distinctive copper ferrule with the right blend of Dupont solid, round and Tapered Tynex and Orel filaments. For brushes that perform no matter what the job. Not only are the XL brushes ideal for interior and exterior projects with all types of paints. They also work great in all types of environments.