Brush With Water Tank Push Button and Derwent Medium Tip Medium point watercolor brush perfect for building textures and layers. Large water body with push button for easy control of water output. Ideal for use with water-soluble paints and pencils. Medium point watercolor brush perfect for building textures and layers. Large water body with push button for easy control of water output. Portable and convenient for indoor and outdoor use. The strong nylon fiber tip maintains its shape and point for continuous use and comes with a protective cap. Comfortable and leak-proof handling. Water-reservoir brushes are perfect for water-based or runny materials. They also work perfectly with distress scrapbooking inks. Brand: Derwent.