Yellow is a cheerful color, and will add a bright touch to any project. Use the Pure Yellow ZIG Memory System Millennium Pen with a 0.3mm (02) tip for your writing, doodling, technical drawing, sketching, journaling and more. The ink in this ultra-fine marker is a water-based pigment ink which is smooth-flowing, photo-safe, acid-free, odorless, lightfast, and xylene-free.