The hard to find and popular Noodler’s flex nib fountain pens enter a new design. Each pen is uses a piston-filling mechanism which accepts bottled ink only and is fitted with a special auto-vent flex nib that can go from a hairline to 1.5mm stroke on paper using slight hand pressure to spread the tines of the nib. Noodler’s describes this as a “fine/medium” nib.
Here is a great value to own a flex nib fountain pen.

![Burmese Ruby Standard Flex Flex Nib Fountain Pen by Noodler's Ink® [piston fill]](https://passion4pens.com/wp-content/uploads/2025/12/Noodlers-Ink-Standard-Flex-Burmese-Ruby-Fountain-Pen-2.jpg)


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