When you want to add some line doodling to letters or shapes, this is a perfect size pen. And again no worries here with these because they will write on everything and not smear.
This pen is such a live saver! You can write on any surface and not ruin your project with smears. Definitely buying more of these!
Love the slick pen - have bought before and was very happy. Love that you can write on vellum and doesn't smudge.