True third-party nibs do not exist, but Japanese makers like Pilot, Namiki or Nakaya supply nibs that are clearly thinner than European brands; a Japanese F is roughly equivalent to a European EF and there are even XF nibs. For the Lamy system the Lamy gold EF nib (from the Studio or Accent) can be fitted to the Logo 06; if needed, a nibmeister can grind it finer still. Paper has a very large influence: on absorbent or rough paper even an EF appears thicker, while satin-finished sized paper (e.g. from Clairefontaine) shows the line noticeably finer. Ink also plays a role — Montblanc Blue-Black / Midnight Blue writes a touch thinner than other water-based inks.