This set of drawing pens features a metal rollerball tip that helps keep strong, consistent lines. With typical fiber-tipped drawing pens, the tips often wear with use over time and dry up due to a small ink capacity. These graphic liners solve this issue with their sturdier tips. The ink within these pens is archival pigment ink. Included in this set are six drawing pens that come in varying sizes: 005 (0.3 mm), 01 (0.4 mm), 02 (0.5 mm), 03 (0.7 mm), 05 (1.0 mm), and 10 (1.5 mm).