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.