I used the set of 4 pens, with matching ink, for writing and illustration throughout my school, college and university years supplemented with Rotring techical drawing pens that had the advantage ...

The competitive landscape of the U.S. technical pen market is dominated by key players such as rOtring, STAEDTLER, Faber-Castell, Koh-I-Noor, Sakura, and Copic, all of which have a strong market ...