Pentel-Arts Aquash Water Brush. This empty water brush is great for solid colours or powdered pigments. Use this brush with watercolour crayons, markers and pencils to spread and smooth colours. Featuring a durable nylon brush that will hold its point use after use. You can create everything from a broad strokes to a fine line. The barrel is soft and easy to hold and use as well as the barrel design preventing the brush from rolling away. The controllable water out-put allows you take total control of your work.