The Nib Engineering That Changes Everything
What Sets XV Flex Pro Apart
Proprietary Stainless Steel Design — Drawn and engineered in our studio, not borrowed from existing designs.
Perfect Ink Flow — No railroading, hard starts, or flow interruptions.
Controlled Flex Response — 0.4mm to 2.0mm line variation with precise pressure control.
Premium Tipping Material — Smooth writing surface that maintains its performance over time.
"Not exaggerating when I say this is the absolute best nib I have ever used. The control and flexibility are simply unmatched." — Jenifer Brown, Verified Customer
The third manufacturer we tried
Making a thin nib bend is easy. Making it bend and keep up with ink is the whole problem — it's the same problem that has Pilot FA owners buying aftermarket feeds for a $320 pen.
The tolerance that matters is where the feed channel meets the flex point. Two of the manufacturers we worked with couldn't hold it consistently. The third could.
We design the nib. They hold the tolerance. That division of labour is why it took two years instead of two months.
So we put it on a kitchen scale
Flex nibs get sold on adjectives — soft, springy, vintage. None of them tell you the one thing you feel after forty minutes of writing: how hard you have to press.
Tines pressed to exactly 1 mm apart. 277.5 g. Buy one and check it.
| Nib | Force to 1 mm | Price |
|---|---|---|
| Magna Carta 14K gold | ~190 g | $385 |
| XV Flex Pro — steel | 277.5 g | 921,00 kr |
| Montblanc 18K gold | ~360 g | $1,000+ |
| Pilot 14K gold | ~400 g | ~$320 |
Ours was measured in-house and photographed. Competitor figures are published bench measurements using the same method — tines pressed to 1 mm, force read off a scale. Prices are for the cheapest pen each nib comes in.
A $320 gold Pilot needs about 44% more force than our steel nib. An 18K Montblanc needs about 30% more.
Gold is the softer metal, but flex isn't decided by the metal — it's geometry. Tine length, how far back the shoulders are cut, how thin the steel is at the flex point. Getting those three right is what the two years and the three manufacturers were actually for.
It arrives like something worth keeping
In a fitted presentation box — not a padded envelope. It looks like a gift because it is one.
A complete threaded nib unit, not a loose nib. No tools, no fitting, no guesswork.
Swaps in under a minute, so one pen covers your notes on Monday and your letters on Sunday.
Collection quality: a nib that earns its place among your finest pens.
Both of these are our nibs, in the same pen body. Left: XV Gold Flex, untipped, for people who already know how to handle a dip nib. Right: XV Flex Pro, tipped, for everyone else. One minute to swap.
Which of our two flex nibs is yours?
Both screw into the same pen. They are not two versions of one nib — they're two different instruments, and picking the wrong one is the most common mistake people make with flex.
XV Flex Pro
Tipped · Soft
- Tipped — a bead of hard metal is welded to each tine, so the nib glides instead of catching.
- 0.4 mm to 2.0 mm of line variation. It takes 277.5 g to open the tines to 1 mm — less force than the gold nibs it gets compared to.
- Works on ordinary paper, with cartridges or bottled ink.
- Behaves like a normal nib when you're not flexing it, so one pen does your notes and your letters.
XV Gold Flex
Untipped · Sharp
- Untipped — a bare Japanese G nib, hand-fitted into a screw-in housing. Sharp by design, not by fault.
- Reaches wider line variation than the Flex Pro can.
- Wants smooth paper and the right ink. Bottled ink recommended; cartridges are not.
- Unforgiving of the wrong angle or a heavy hand — it will catch and skip if you write with it the way you write with a normal pen.
Not sure? Buy the Flex Pro.
It's the one almost everyone should start with. It flexes when you ask it to and behaves itself when you don't, on the paper already on your desk.
The Gold Flex is the better nib in trained hands and the wrong nib in untrained ones. That single choice, made the wrong way round, is behind nearly every disappointed review we've ever had — and we'd rather lose the upsell than have you write another one.
Real Reviews From Real Writers
Choose Your Pen & Nib
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XV Nusa Fountain Pen - Ocean
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XV Nusa Fountain Pen - Smoke
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Real time, not sped up. 0.4 mm on the upstroke, 2.0 mm on the down — and it takes 277.5 g to get there. Softer than the solid gold nibs it’s usually compared to.
You don't have to be a calligrapher
That's a lined notepad and everyday handwriting.
Look closely at the sample. The only thing happening is a little more pressure on the capitals — no special grip, no guide sheet, no particular paper.
That's what tipping buys you. The nib flexes when you lean on it and goes straight back to writing a shopping list when you don't, on whatever is already on your desk.
The row of loops is the only part that takes practice. The rest is just your handwriting, with the volume turned up.
