The Rotring Rapidograph technical pens use Rotring's unique capillary mechanism ink cartridges, invented to offer consistent ink flow. The way the Rapidograph is designed makes it virtually maintenance free. Each time a new ink cartridge is inserted, the pen gets a complete new pressure equalization system allowing for instant ink flow without leaks or blobs until the cartridge is empty.
Each pen is fully equipped with one black ink cartridge, a stainless steel drawing point, and a color-coded barrel and cap with double seal and clip. The pen is only refillable with Rotring Capillary ink cartridges. Ink cartridges in various colors as well as tip replacements are available.