Pilot fountain pen cartridge ink blue 12 pieces IRF12SL

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[Type] Cartridge ink for fountain pens and desk pens [Quantity] 12 pieces [How to use cartridge ink] Remove the stem of the fountain pen, point the pen tip upward, and insert the cartridge. [How to use cartridge ink] Insert the cartridge straight without turning it. [How to use cartridge ink] After installing the cartridge, if the ink does not come out even after leaving it for a while, press the cartridge lightly from both sides to send the ink to the nib and you will be able to write smoothly.