Tombow Dual Brush Pen has been a bestseller since we opened the store in 2015, because so many different kinds of artists use them. With a soft brush tip on one end and a precise bullet tip on the other, they're all-inclusive tools for illustration. The ink is water-based and water-blendable: use a wet brush for dreamy watercolor effects and color mixing. The brush tip is very popular with calligraphers, with a spring that makes those thick-to-thin transitions easy. And the two-tip combo is also beloved by students and bullet journal practitioners. Use the brush tip with pale colors for highlighting and color code with the bullet tip.