The water tank brush is a convenient tool for watercolor techniques. The water flow is regulated by pressure on the body. The brush with water tank and protective cap is ideal for on-the-go. Suitable for work with ABT Dual Brush Pens and other water-based pens. For calligraphy, watercolour, illustrations, urban sketching, Manga drawing and much more. The brush with water tank comes empty and is easy to fill thanks to the unscrewable tank. The tip can be easily cleaned with water.