Derwent Large Bevel Tip Push Button Water Reservoir Brush Large chisel-tip watercolor brush perfect for versatile strokes and washes. Large water body with push button for easy control of water output. Ideal for use with water-soluble paints and pencils. 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.