The standard fountain pen cartridges from ONLINE guarantee high-quality ink and intensive writing ink of consistent quality. They are suitable for all ONLINE ink systems as well as all other standard fountain systems. Suitable for: ONLINE, Pelikan, Faber Castell, Stabilo, Schneider, Herlitz, Kaweco. NOT suitable for: Lamy, Parker, Waterman. Packet contains 6 cartridges, international standard format.