FPR-FNF #6 Two-tone Ultra Flex JoWo Compatible Nib Unit (ebonite feed) FPR Guru Try these recipes:

Try these recipes:

the 4c is very similar in size to the Model 4 but with rounded ends

Available colors (listed left to right in photo):  Rootbeer Acrylic

Yellow and Pink

For size reference we have take a photo of the Mammoth next to a Pilot Metropolitan and Lamy Safari

FPR-FNF #6 Two-tone Ultra Flex JoWo Compatible Nib Unit (ebonite feed) FPR Guru Try these recipes:FPR has teamed up with Flexible Nib Factory to bring you #6 JoWo 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 JoWo threaded pen including our FPR Tanoshii, FPR Tanoshii Urushi Art and FPR Statesman fountain pens. They write with an extra fine 0. 4mm line on the thin end and 2. 0mm fully flexed. They