Rotring Rapidograph Techincal Pen Ink Capillary Cartridges - Black pack of 3
Rotring Rapidograph Black ink cartridge 3/pack.
Rotring’s unique capillary cartridge
Innovative cartridge including the 'ink helix' system, so every time it is changed, the pen has a new, clean, helix and a new pressure equalisation system for easy maintenance/operation.
Improved temperature stability through extra large ink-helix volume and optimum location of the ventilation opening for best reliability.
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