Innovative cartridge including the ink helix so every time it is changed, the Rapidograph pen gets a new clean helix and a new pressure equalisation system for easy maintenance. Ink can be used down to the last drop. Pack of three cartridges.
For tracing paper, vellum drawing paper and lineboard. Easy flowing, high opacity, good adhesion, smudge-proof when dry, lightfast, not erasable, suitable for all forms of reproduction.
Note: only suitable for use with Rotring Rapidograph pens.
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