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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Matching Cartridge

Product ID: 172094317

Details

Brand
Asvine
Item Weight
0.09 kg
Number of Pieces
30
Point Type
Chisel
Style
Fountain

⚡quick-dry ink formula

📏3.4mm bore diameter precision

🖋️30-pack bulk refill

RM82

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

BULK INK POWERHOUSE - 30 premium black cartridges to keep your creativity flowing without interruption.
ECO CONSCIOUS SAFE - Formulated with neutral pH, non-toxic natural dyes for a clean, worry-free writing experience.
SMUDGE FREE FAST DRYING - Ink dries in seconds, ensuring your important notes stay crisp and professional.
PRECISION FIT GUARANTEED - Designed with a 3.4mm bore diameter for seamless compatibility with select fountain pens like Hongdian.
EFFORTLESS SMOOTH WRITING - Experience consistent, break-free ink flow that glides elegantly across every page.

Asvine’s 30-pack black ink cartridges feature a precise 3.4mm bore diameter, delivering smooth, consistent ink flow with a quick-dry, non-toxic formula. Perfectly tailored for fountain pens like Hongdian, these cartridges combine bulk value with professional-grade performance to keep your writing sharp and smudge-free.

Specifications

ASIN	B08259HPC7
Best Sellers Rank	#2,523 in Office Products ( See Top 100 in Office Products ) #11 in Ink Pen Refills
Brand Name	Asvine
Customer Reviews	4.5 4.5 out of 5 stars (12,247)
Ink Color	Black
Item Weight	0.09 kg
Manufacturer	Hongdian
Manufacturer Part Number	HDBI608F7
Model Number	HDBI608F7
Number of Pieces	30
Point Type	Chisel
Style	Fountain
Unit Count	30 Count

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