Pen Pilot of type rollerball, with multicolour ink and a tip thickness of 0.7mm. Rollerball pens have a writing similar to that of a fountain pen. They produce the most ink compared to other types, have comfortable writing, do not skip, but may smudge. Not recommended for low-quality paper and left-handed individuals. The ink lasts less compared to ballpoint and gel types. It erases without residue and without damaging the paper.