For use with the Rotring Rapidograph drawing pen, this ink is suitable for work on tracing paper, vellum and drawing paper. It is easy-flowing has a high opacity and is smudge-proof when dry. It is also waterproof and light-fast. The unique capillary cartridge has a pressure equalisation system and ink helix giving you a new ink helix every time you change the cartridge.
Pack of three cartridges in either black, blue or red ink.