Pack of 12 blue 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
Ohto C-305p Ceramic Rollerball Pen Refill - Black
Ohto Pen .7mm refill for Needle Point Horizon
Kaweco Royal Blue Fountain Ink Cartridges
Kaweco Midnight Blue Fountain Ink Cartridges
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