Tombow ABT Dual Brush Pen - N00. This is a water-based, odorless, watersoluble, non-bleed, non-toxic, and acid-free dual brush pen. It features a fine tip for precise lines and a flexible brush tip that varies in thickness with pressure. It's ideal for hand lettering, watercolor, illustrations, bullet journaling, stamping, and drawing mangas and mandalas. The water-based colors can be mixed for beautiful color gradients and watercolor techniques. Tombow is a Japanese family business known for high-quality and reliable writing instruments.