The MAZU Water Brush Pen is perfect for any activity which you would normally have to use a paintbrush and a glass of water, just with less mess and clutter! These water brushes can be used with watercolor crayons, markers, watercolor pencils and traditional watercolors to smooth and spread color, and create an array of dramatic effects. It can also be filled with highly watered down and liquid colored inks. Also, it is very effective to use for controlled blending, highlighting and shadowing.