Dual brush pens are Ideal for fine art, illustrations, doodling, journaling, hand lettering and more. Each brush pen features water-based, acid free ink that easily blends using other markers or a colorless blender. Dual brush pens feature a nylon brush tip for a variety of strokes, and a fine tip for even, consistent lines. A single ink reservoir in each pen ensures exact color matching time after time. The brush tips also feature a self-cleaning function that returns to its original color after blending.