FPR-FNF #6 Two-tone Ultra Flex Bock Compatible Nib Unit (ebonite feed)

FPR has teamed up with Flexible Nib Factory to bring you #6 Bock compatible nib units that are fitted with FPR ultra flex nibs and FNF ebonite feeds for maximum ink flow for flexing. These units offer all the generous flow of an ebonite feed and will fit any #6 Bock threaded pen including our fountain pens.Theywrite with an extra fine 0.4mm line on the thin end and 2.0mm fully flexed. They are tipped with top quality German made material for a smooth writing experience andare manually adjusted to produce a softer and more enjoyable flex experience.(Note: These units do not have Bock nibs. They are fitted with FPR nibs inside a housing that is threaded to fit pens that take #6 Bock nib units.)Features:Feed material: EboniteAccepts standard international cartridges and converters.