Ballograf® Original Refill cartridges have a robust metal tip that provides controlled, thick ink lines. Fits all Ballograf pens except Ballograf Pocket. For the writing feeling to be as good as it can be, a refill of the highest quality is essential. That's why Ballograf manufactures its nibs in stainless Japanese steel and the balls are in very hard tungsten carbide. The blue and black ink is certified by the Swedish Archives, which means that pens with these inks produce writing that is very light-resistant. At the end of each cartridge is a lump of grease that holds tightly and ensures that the ink does not dry, even if the pen is left lying down for a long time. Each cartridge writes a full 8000 meters. Fits all Ballograph pens except Ballograph Pocket. - Fits all Ballograf pens except Ballograf Pocket. - Approved according to ISO 11798 Swedish Archive - Ballpoint pen, ink refill - For use with all Ballograph pens except Ballograf Pocket. - Nib: Medium - Pen body material: Stainless steel - Writing length of 8 km - Color: Black ink