Kuretake ZIG Clean Color f Chalk Pastel Set with all 6 Colors: 000, 012, 021, 030, 040, 050 ZIG Clean Color F pens are a dual tip water-based pigment, this make them suitable for dark papers. Tip sizes are; extra fine (.5mm) and a large (1.2mm) bullet point. ZIG Clean Color F are most suitable for paper. ZIG Clean Color F pen are great for illustration work, cartooning, and fine arts. Pair with our ZIG Blender or our ZIG BrusH2o for amazing blending and watercolor effects. Blending Tips: Taking two ZIG Clean Color F pens, for a few seconds gently touch nib-to-nib. Keep the two pens horizontal and ink will flow from the top pen onto the tip of the second pen. After using the blended pen, clean excess ink off onto a piece of scrap paper or towel.Kuretake