FPR Stainless Steel Nib - Size #5.5 - EF Ultra Flex (Nib Only)
The best of the steel flex nibs
Turn an ordinary fountain pen into a tool for expressive writing and sketching. The FPR #5.5 EF Ultra Flex nib delivers dramatic line variation with very light pressure, giving you hairline upstrokes and broad shaded downstrokes from the same nib.
Designed for users who want softness and character without vintage level fragility, this nib rewards a gentle hand and slower, intentional writing.
What set's it apart
- Fine hairlines with broad expressive strokes
- Softer feel than most modern steel nibs
- Excellent for modern calligraphic writing, sketching and ink shading
- Adds character to everyday handwriting
- A popular upgrade for compatible Jowo #5 or #5.5 fountain pens
Practical tips
For best results, use wetter inks, fountain pen friendly paper and a slower writing speed with controlled pressure. This nib is designed for expressive writing, not rapid flex calligraphy. Let the nib open naturally rather than forcing it.
FAQs
How much line variation can it achieve? The EF Ultra Flex nib typically writes a very fine extra-fine line with light pressure, increasing up to approx. 1.5-2mm under controlled flex
Which pens will it fit? The #5.5 EF Ultra Flex nib is commonly fitted to pens using #5 or #5.5 sized friction fit nib units. This includes Fountain Pen Revolution and TWSBI Diamond 580 pens, and can be adjusted to fit TWSBI Eco.
How can I minimise ink railroading? Ultra flex nibs demand more ink than standard nibs. Pens with dry feeds may railroad or starve during heavy flexing. Use wet inks and a slow writing speed.
How do I fit the nib to my pen? Remove the old nib and feed together. Centre the new nib over the feed, ensuring the slit lines up with the ink channel and that the feed sits close beneath the nib. Push both back into the section until secure.
What's included
- FPR Stainless Steel nib x 1
- Free nib tuning from LarryPOST
Ink pairing suggestions
- Pilot Iroshizuku
- Sailor inks
- De Atramentis Document inks for permanence
Build your practice
- Works well with TWSBI Diamond 580 fountain pens
Specifications
- Nib size: #5.5
- Nib type: EF Ultra Flex
- Material: Stainless steel
- Finish: Polished silver / chrome finish
- Line behaviour: From hairline to broad strokes (under pressure)
- Pressure response: soft
- Best use: Modern calligraphy
- Fit: Friction-fit #5/#5.5 compatible fountain pens
This is the steel flex nib that actually flexes and snaps back into line.