All-round pens for fine-point technical drawing and illustration. Micron pens will not clog, feather-out or bleed once ink has dried. Fade-proof against sunlight or UV light, they contain archival quality Pigma ink which is acid-free, water-based, quick-drying on porous surfaces and dries to a waterproof finish. 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.45mm and 0.5mm line widths. Black ink.