FPR #6 Two-tone EF Ultra Flex Nib

These steel custom adjusted #6 flex nibs have been custom ground at the shoulders to offer a much softer ultra flex feel. They write with an extra

Jowo Compatible Nib Unit With Kanwrite 6 flex Fountain Pen Nib

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Set of 2 Kanwrite No.6 35mm EF Ultra Flex Fountain Pen Nibs

Bock Compatible Nib Unit with Kanwrite #6 Ultra Flex Fountain Pen Nib

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Nib Unit ultra Flex for Kanwrite Heritage Fountain Pens - Singapore

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FPR #5.5 Chrome EF Ultra Flex Nib – Fountain Pen Revolution

Osprey Pens Replacement Nib Units - Size #5.5 FLEX NIB UNITS - EEF, EF, F, Med, Broad

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FPR 5.1mm Standard Ebonite Feed – Fountain Pen Revolution