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 acid-free, chemically stable and fade resistant. It does not smear, feather or bleed-through on most papers. Set includes a range of 6 nib sizes including 005 (.20mm), 01 (.25mm), 02 (.30mm), 03 (.35mm), 05 (.45mm) and 08 (.50mm).