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The rapidograph uses rotring's unique capillary cartridge. The pressure-equalization system, including ink helix is part of the ink cartridge which ensures that every time you change the cartridge, you get a clean new ink helix. This means that you never need to clean the ink helix and top reliability is guaranteed.
Rotring Rapidograph 0.18mm Technical Drawing Pen (S0203150) - B000J6A1P4