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 ...

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 ...