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It is a cartridge for Fountain Pen (4550344596883).

Measurements:

Directions for Use:

Remove the cap, rotate the lower shaft counterclockwise to remove it, and pull out the ink cartridge while turning it. Insert the stainless steel ball side of the ink cartridge from below with the pen tip facing up.
To change the ink color, wash the pen tip with lukewarm water or water and dry it before inserting the ink cartridge.