Add a splash of colour to your document with these S.T. Dupont royal blue fountain pen ink cartridges in which you get two packs of six. The ink cartridges have been designed to fit the S.T. Dupont Olympio, Défi, Caprice, Néo-Classique, Classique 2, Fidélio, D.Link and the Ellipsis range of fountain pens. These royal blue refills are also the perfect colour for signing official documents.