The Winsor & Newton Cotman Brush Series 666 is a high-quality brush designed for professional artists. This 1.5 inch brush is made from a blend of synthetic fibers that provide excellent color carrying capacity and a smooth, even finish. The brush is designed to hold its shape and spring back into shape after use, making it ideal for a variety of painting techniques. The brush is also easy to clean and maintain, making it a great choice for both beginners and experienced painters. The brush is suitable for use with watercolor, acrylic, and oil paints, and can be used on a variety of surfaces, including canvas, paper, and wood. The brush is also lightweight and comfortable to hold, making it easy to use for extended periods of time. With its superior quality and versatility, the Winsor & Newton Cotman Brush Series 666 is an excellent choice for any artist looking for a reliable and durable brush.