Do these ink cartridges fit the Amazon Basic fountain pen?

NO, they most definitely do not. The ones that DO fit the Amazon Basics fountain pen are these: https://www.amazon.com/Refillable-Cartridges-International-Calligraphy-Rollerball/dp/B07D43QR17/ref=psdc_1069832_t2_B08259HPC7 I have tested those and they are what I'm using right now in my pen.

Are these the correct cartridges for Hongdian extra-fine (4mm) pen? They were linked to by Amazon, but after installing, no ink coming out.

Yes, The hongdian cartridges work with Hongdian fountain pen. If there is no ink comeing out, you can follow the instructtion below: 1) Soak the nib part in warm water for five minutes ,Reassemble the pen after cleaning, and test ink flow. If this doesn't help, try the next step. 2) Press the nib on the paper to make it spread a little, then it will flow properly. If it does not work, please send us a message.

How much fluid is in each cartridge?

They are the .5ML ones basically the small ones, it is great ink for the price it does it’s job and it’s dark enough when writing, you will enjoy🤙🏾

Will this fit Picasso 902 fountain pen?

Sorr, they do not fit picasso fountain pen. For picasso fountain pen, you can purchase jinhao cartridges for it.

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🖋️ Elevate your pen game — never run dry on style or substance!

SMUDGE FREE SPEED - Quick-drying ink ensures your important notes and signatures stay crisp and clean.
PRECISION FIT GUARANTEED - 3.4mm bore diameter designed specifically for compatible fountain pens like Hongdian models.
EFFORTLESS SMOOTH WRITING - Experience consistent, break-free ink flow that glides elegantly across every page.
SAFE ECO CONSCIOUS FORMULA - Neutral pH and non-toxic natural dyes protect your health and the environment.
BULK INK SUPPLY FOR POWER USERS - 30 black ink cartridges to keep your creativity flowing without interruption.

The Hongdian Fountain Pen Ink Cartridges come in a convenient 30-pack of black ink refills with a precise 3.4mm bore diameter, compatible with select fountain pens. Featuring a smooth, uninterrupted ink flow, quick-drying, and non-toxic neutral pH ink, these cartridges ensure a premium writing experience that professionals can rely on for crisp, smudge-free documents.

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Manufacturer	Hongdian
Brand	Asvine
Model Number	HDBI608F7
Colour	Black
Closure	Screw
Size	3.4 mm
Point Type	Chisel
Ink Colour	Black
Manufacturer Part Number	HDBI608F7
Manufacturer	Hongdian

Hongdian Fountain Pen Ink Cartridges Black Color, Set of 30 Refill Ink Cartridges, 3.4 mm Bore Diameter

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