Rotring fountain pens, including the popular calligraphy set pens, utilize standard international-sized ink cartridges. Colorado Pen offers our own 1-1/2" cartridges in twelve different colors.
We also offer a converter that may fit your Rotring fountain pen. This opens the world to an economical ink supply in lots of colors and brands. The Colorado Pen brand features a huge 90ml bottled of specially formulated ink that cleans your pen as you write. We also have standard Waterman and Pelikan ink bottles, and a premium ink from Pelikan called Edelstein.