Sakura Pigma Micron Set of 3 Calibrated Pens Calibrated fine-liner technical pen, with pigment ink that combines pigments and water. Ideal for artistic and technical drawings. Permanent, water, light and chemical resistant. When dry it has a neutral pH. Both technical and artistic applications: graphic arts, scrapbooking, cartoons, doodling, file recording, ink illustrations and personal diaries. Contain three calibrated black pens: - 08 (0,50 mm.) - 10 (0,60 mm.) - 12 (0,70 mm.)