These superfine technical illustration pens feature waterproof, archival india ink that will not smear, feather, or bleed on most papers. When used with a light hand, Microns always provide smooth, consistent, and skip-free lines. Perfect for illustration, mix media, journaling, drafting, or accounting. The color 6-set comes with black, blue, green, red, rose, and sepia, all in size 05 (.45mm)