The rollerball refills listed below fit S.T. Dupont Rollerball pens. Please, carefully compare the shape and dimensions with your original refill. If you need a different type of refill for your S.T. Dupont rollerball pen, please contact me and I will try to help you locate the refill you are looking for! Require Ballpoint Pen Refills instead ? Or Fountain Ink Cartridges ?