These fine-point pens feature waterproof, quick-drying pigmented ink for permanency and true color reproduction. Use for graphics, drafting, illustration or accounting. Experience smooth, skip-free writing and crisp ink colors that leave consistent lettering and lines every time. The archival ink is chemically stable and fade-resistant. It does not smear, feather or bleed through on most papers. The sets feature a range of nine nib sizes including 01 (.25mm), 03 (.35mm), 05 (.45mm) 08 (.50mm), 10 (.60mm) and 12 (.70mm).