Montegrappa fountain pens can be refilled with standard international-sized ink cartridges or with an ink converter and any brand of bottled ink.We offer Montegrappa branded ink cartridges if you like those. Colorado Pen offers international-sized ink cartridges in 12 different colors. This specially formulated ink helps keep your Montegrappa fountain pen writing smoothly.If you need an ink converter, those are offered below. Then choose a bottle or two if ink from our large selection. Colorado Pen ink arrives in a huge 90ml bottle. Pelikan offers standard ink or its premium Edelstein ink in nine vibrant colors. Waterman bottled ink is offered in all the favorite colors.