Tombow’s Dual Brush pen has two tips—a high-quality, flexible nylon fiber brush tip and a fine bullet tip. Use the brush tip to create fine, medium, and broad strokes. It is resilient, retaining its point even after extensive use. For consistent fine lines, the sturdy fine tip is ideal. The water-based ink blends easily with other colors, and it is acid-free, non-toxic, and odorless.