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

Product ID: 253894242

Details

Brand
Asvine
Item weight
0.09 Kilograms
Number of pieces
30
Point type
Medium
Style
Fountain

⚡Quick-dry, smudge-free ink

🖤30-pack black ink cartridges

🖋️3.4mm bore diameter precision

Description

🖋️ Elevate your writing game with ink that keeps up with your hustle!

SAFE CLEAN - Neutral pH, non-toxic natural dyes protect your pen and your health.
PRECISION FIT - 3.4mm bore diameter engineered for seamless compatibility with select fountain pens like Hongdian.
BULK INK POWER - 30 premium cartridges to keep your creativity flowing without interruption.
FAST DRY FORMULA - Ink dries in seconds, eliminating smudges and preserving your professional work.
EFFORTLESS WRITING - Smooth, consistent ink flow ensures every stroke is flawless and elegant.

The Asvine Fountain Pen Ink Cartridges come in a convenient 30-pack of black ink refills, designed with a precise 3.4mm bore diameter for compatibility with select fountain pens such as Hongdian. Featuring smooth ink flow, quick-drying, and non-toxic natural dye composition, these cartridges ensure a clean, professional writing experience without smudges or interruptions.

Specifications

ASIN	B08259HPC7
Best Sellers Rank	#7,681 in Office Products ( See Top 100 in Office Products ) #41 in Pen Refills
Brand Name	Asvine
Customer Reviews	4.5 4.5 out of 5 stars (11,598)
Ink Color	Black
Item Weight	0.09 Kilograms
Manufacturer	Hongdian
Manufacturer Part Number	HDBI608F7
Model Number	HDBI608F7
Number of Pieces	30
Package Size Name	Set of 30
Point Type	Medium
Style	Fountain
Unit Count	30 Count

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