The Wooster 2" Pro Classic Black China Bristle Angle Sash Brush is a professional-grade paintbrush that is ideal for painting trim and cutting in around corners precisely. It has high-quality black China bristles that are renowned for their firmness and ability to retain paint well. The angled sash design facilitates cutting-in and detail work, making it popular among professional painters and DIY enthusiasts alike. This brush is part of Wooster's Pro Classic series, which is noted for its durability and high performance.