Make it easy to play and express yourself with the Millennium Pen ZIG Memory System 5-Piece Pen Set. These ultra-fine markers by Kuretake have a smooth-flowing ink for sketching, writing, journaling, doodling, and more. They feature a water-based pigment ink that is photo-safe, odorless, lightfast, xylene-free, and acid-free. Included are five 0.35mm (03) tipped pens in black, blue, yellow, red, and green.