Libelle has the best values for a carbon fiber pen one has ever seen. The Libelle carbon fiber pens are very popular and a perfect pen for a corporate gift, these pens are refreshingly different, high quality, and priced to meet your corporate needs. Fountain pen comes with cartridge or converter ink system, and the German iridium nib point is a medium width. All Libelle Carbon Fiber roller ball and ballpoint pens use Schmidt refills, which are made in Germany and are compatible with Parker refills.