Doodle happy bright images or motifs using the Pure Yellow ZIG Memory System Millennium Pen from Kuretake. Millennium pens are ultra-fine, and this particular pen has a 0.45mm (05) tip. The smooth-flowing water-based pigment ink is lightfast, acid-free, xylene-free, odorless, and photo-safe. Use the pen for journaling, writing, technical drawing, sketching, and more.