Graf von Faber Castell fountain pen cartridges comes in packs of 6. This range features 9 vivid colours with beautiful shading characteristics. Suitable for cartridge/converter pens that take standard-size cartridges (see this page for more information).
All colours are light-fast and all colours except Royal Blue, Hazelnut Brown and Garnet Red are certified to ISO 12575-2 for permanence. In practice, some colour is shed upon immersion in water but in general the ISO-certified inks are fairly water resistant.