Pack of 12 black disposable ink cartridges for Pilot fountain pens. They are proprietary, so they will only fit Pilot pens.
Will fit in the Pilot Kakuno, available in Clear and White/Blue
Kaweco Pearl Black Fountain Ink Cartridges
CDT Tradio Plastic Fountain Pen Refill: Black
Kaweco Royal Blue Fountain Ink Cartridges
Kaweco Midnight Blue Fountain Ink Cartridges
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