Deluxe-quality, made of rustproof copolymer polypropylene. Copolymers have improved impact resistance and are less brittle than standard polypropylene, especially in cold temperatures. Use a form-fitting liner (R406, BR496, or BR407) for instant cleanup. The Wooster Brush Company has been manufacturing innovative, high-performance painting products right out of Wooster, Ohio USA since 1851. You can feel confident knowing Wooster is the name behind your tools.