Selection of 4 Light Cool Gray and 4 Cool Gray Pigma Micron and Brush pens: Pigma Micron 01 (0.25 mm), Pigma Micron 05 (0.45 mm), Pigma Micron 10 (0.60 mm) and Pigma Brush. With these buildable grays you can add shading, depth, visual accents and layering effects to illustrations, drawings, bullet journal spreads and so much more. About Sakura Pigma Micron Pigma Micron is the world's first professional-quality fineliner with water-based pigment ink. Pigma ink dries quick, is bleed proof and waterproof once dry. Suitable for all light-coloured paper surfaces. The long metal tip makes the fineliner ideal for use with rulers and templates.