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The Rotring isographs are intended to replace the company's rapidographs. All their parts (nib and barrel) are identical to those of the rapidographs. The difference lies in the filling method: while the rapidographs use a cartridge, the isographs have an empty reservoir, which is filled with ink.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.