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Cobalt Blue
Light Olive
5mm (including the clip）* 132mm when writing
and illustrations
Superior adhesion — adheres reliably to a wide variety of surfaces
Rotring 23ml Black Ink for Isograph - pack of 5 Sale Cobalt BlueThis pack ensures you'll always have a fresh cartridge on hand when inspiration strikes. Compatible with Rotring Isograph technical pens, each cartridge provides smooth, waterproof ink flow that resists fading and smudging. Perfect for professionals and serious hobbyists who demand reliability in every stroke.
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