Derwent Waterbrushes are perfect for use with water soluble pencils or for watercolour painting on the go. These brushes are designed for the easy transportation and storage of water when you're away from home or the studio. They are refillable, leak proof and easy to clean. The brush separates into two parts: a flexible brush tip and a 10 ml barrel handle to carry the water. The comfortable grip is great for controlled blending, shading, and highlighting. Package contains 2 round brushes and one flat brush. Barrel: Transparent polypropylene Bristles: Nylon fibers Sizes: 2 mm round, 4 mm round, 5 mm flat