Rapidograph Pen Staedtler Mars Matic 700 with a 0.40 mm tip. Staedtler pen with a high-quality metal nib, 0.4 mm line width, ideal for maximum precision in linear and architectural design. The paper individual packaging includes the barrel with the metal nib and an ink cartridge. The different colors by size help in quickly selecting the design thickness. The ink does not dry thanks to the double sealing system on the cap, and the ink flow remains stable due to the collection system. Easy ink refill from a bottle or cartridge.