Spare Ink Cartridges for Fountain Pen and Inkballs

Was pleasantly surprised these cartridges fit both my fountain pen and inkball—makes swapping colors between pens much easier. The black ink flows smoothly without any skipping.

Picked up a set of these short international cartridges for my fountain pen and was pleasantly surprised how smoothly they fit—no leaks or fuss. The black ink flows consistently from the first word to the last.