The Winsor & Newton Cotman Brush Series 666 is a high-quality brush designed for professional artists. This 1/4 inch brush is made from a blend of synthetic fibers, which are both durable and flexible. The fibers are arranged in a unique pattern to ensure even coverage and a smooth finish. The brush is also designed to hold its shape and resist wear and tear. The handle is made from a lightweight, yet strong material, making it comfortable to use for long periods of time. The Winsor & Newton Cotman Brush Series 666 is ideal for use with watercolors, acrylics, and gouache. It is also suitable for use with oil paints, although it is recommended that the brush be cleaned thoroughly after each use. The brush is easy to clean and maintain, and can be used with a variety of mediums. It is also suitable for use with a variety of surfaces, including canvas, paper, and wood. The Winsor & Newton Cotman Brush Series 666 is a great choice for professional artists looking for a reliable and durable brush. It is easy to use and maintain, and is suitable for a variety of mediums and surfaces. The brush is designed to hold its shape and resist wear and tear, making it a great choice for long-term use.