"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). Capacity of standard-size cartridges is approximately 0.8ml. They are made by, for example, Diamine, Herbin, Kaweco, Monteverde, Private Reserve, rotring, Visconti, Waterman and Yard-O-Led.
See also our Cartridge and Converter Compatiblity page.
The picture below shows Diamine standard size cartridges.
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