Wooster Ultra/Pro Firm Lindbeck Brushes are made from the highest quality purple nylon/sable polyester. Their firm formulation gives you consistent control and even flow. Great for 1) all medium-bodied coatings like acrylic paints or latex enamels, 2) warm temperatures indoors or out, and 3) whenever a painter wants a time-saving firm brush. Features include a treated maple tapered wood handle and a square rust-resistant steel ferrule.