Medium black refills for Roller pens are sold in boxes of 10. For the following pens: Olympio, Défi, Liberté, Néo-classique large, Classique 2, D.Link/Caprice, Fidelio, Ellipsis, Montparnasse, Gatsby, Line D, Mon Dupont by Karl Lagerfeld, Streamline R, New Line D, D-Initial.