Porsche Design Fountain Pen. The shaft of the pen is formed by ‘TecFlex’ in a special steel version interwoven with fine gold threads. All other metal parts feature high-quality silver plating and a palladium coating for a silky, matt finish. Available in F, M and B nib widths. The 18-carat gold fountain nib is rhodanized. Its radial ground finish guarantees an optimum stroke and makes this an extremely comfortable pen to write with.