Montegrappa fountain pens fit any brand of standard international-sized ink cartridges. If you have used the Montegrappa brand and been pleased, we have those. Colorado Pen and Pelikan offer a wide range of ink colors in this size cartridge. You may opt to use an ink converter to refill with bottled ink. We have those. Then you can choose from any brand of bottled ink, including Colorado Pen, Pelikan, Edelstein or Waterman. We have those, in all kinds of colors.If your Montegrappa pen twists at the top to deploy the point, it's a ballpoint. Check out the Ballpoint Refills for Montegrappa window below. Montegrappa's own refill is shown, as well as other Parker-style ballpoint refills in three ink types, three point sizes and ten different colors. Select from standard ballpoint ink, liquid ink or gel ink.If your pen has a removable cap and isn't a fountain pen, it's a rollerball! Click on the Rollerball refills for Montegrappa window below.