Rotring Rapidograph Technical Drawing Pens _1
The Rotring Rapidograph is a precision drawing pen which uses refillable ink cartridges.
Colour coded stainless steel nibs.
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.