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My pen takes International size cartridges. What are these?
"International" size, "International Standard" or just "Standard" size cartridges are generally used in pens that do not take proprietary cartridges (ie not Lamy, Parker, Aurora, Sheaffer, Pilot/Namiki, Sailor or Cross).
Standard-size cartridges are 38mm (1.5in) long and taper towards the part that goes into the nib unit (grip section). The capacity of standard-size cartridges is approximately 0.8ml.
They are made by, for example, Diamine, Herbin, Kaweco, Monteverde, Private Reserve, rotring, Visconti, and Waterman.
See also our Cartridge and Converter Compatibility page.