万年筆・インクボール用予備インクカートリッジ

I’ve been using these in my Pocket 6 for a few weeks now and the black ink flows really smoothly with no skipping. The short international size clicks in perfectly, and it’s nice knowing I can grab blue or empty ones to mix in my own colors later.

These short cartridges are a lifesaver for my Pocket 6—the standard international size means I can swap colors in seconds without any mess. The empty ones let me experiment with my own ink blends, and they've never leaked in my bag once.

Filling these from a bottle of my favorite ink is so much tidier than I expected, and the standard international size means I can swap between my Pocket 6 and Inkball without any fuss. The black ones write crisp and dry fast, too.