The Rotring Rapidograph uses a cartridge, and there is technical language, which I won't attempt to repeat, that says in essence-- lit
Rotring Isograph Pen - 0.5 mm
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Rotring Isograph Review — The Pen Addict
Designed and manufactured with precision for optimum performance. 3-pen set of high-precision technical pens with refillable ink reservoirs is perfect for College-level students. Wear-resistant, hard chrome-plated thin tip allows exquisite detail work. Nib is crafted from stainless steel. Push-on sleeve provides easy access to ink helix and fast cleaning. Color coded barrel indicates line width. Refillable ink reservoir is ideal for frequent drawers.
Rotring Isograph College Set
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Rotring Rapidograph 0.35 mm Review — The Pen Addict
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