# FPR Stainless Steel Nib - Size #6 - EF Ultra Flex (Nib Only)

## Maximum expression from a steel flex nib

The FPR #6 EF Ultra Flex nib is designed for serious expressive writing. It delivers an extra fine hairline under light pressure and opens into broad, dramatic strokes with controlled flex. This is one of the most responsive steel flex nibs available, built for users who want vintage style expression without using vintage nibs.

## What set's it apart

-   Extreme line variation from hairline to broad stroke
-   Very light pressure needed to activate flex
-   Excellent for calligraphy, expressive journalling and flourishing
-   Fine baseline line for detailed writing  
    
-   Strong ink response for dramatic shading and contrast  
    

### Practical tips

For best results, use wetter inks, fountain pen friendly paper and a slower writing speed with controlled pressure. 

### 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. 2-3mm under controlled flex

**Which pens will it fit?** The #6 EF Ultra Flex nib is commonly fitted to pens using #6 sized friction fit nib units. This includes Fountain Pen Revolution, OPUS 88 size #12 pens and TWSBI 700R Vac pens.

**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](https://www.larrypost.com.au/blogs/blogs/smooth-writing-with-fountain-pens?_pos=2&_sid=a2392eaaf&_ss=r) from LarryPOST

### Ink pairing suggestions

-   Pilot Iroshizuku
-   Sailor inks
-   De Atramentis Document inks for permanence

### Build your practice

-   Works well with OPUS 88 size #12 pens and TWSBI 700R fountain pens

### Specifications

-   **Nib size:** #6
-   **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 #6 compatible fountain pens

A nib that is capable of dramatic results, through technique, not force.

## Details

- **Price:** 39.95 AUD
- **Vendor:** FPR
- **Type:** Fountain Pen Replacement Nib
- **Tags:** Category_LarryPOST, Category_LarryPOST/Pens/Replacement Nibs, new

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 39.95 AUD | In stock |

## Images

- FPR Stainless Steel Nib - Size #6 - EF Ultra Flex (Nib Only)
- FPR Stainless Steel Nib - Size #6 - EF Ultra Flex (Nib Only)

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> Source: [LarryPOST](https://www.larrypost.com.au/products/fpr-stainless-steel-nib-size-6-ef-ultra-flex-nib-only)
> Updated: 2026-08-13