Rotring Rapidograph Technical Precision Pen (0.35mm)

For tracing paper, vellum drawing paper and lineboard.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.