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

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 smooth ink

⚙️3.4mm bore precision fit

🖋️30-pack bulk refill

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5305 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖋️ Elevate your pen game with ink that means business.

BULK INK POWERHOUSE - 30 premium black cartridges to keep your creativity flowing without interruption.
SAFE CLEAN FORMULA - Neutral pH, non-toxic natural dyes ensure your writing is as safe as it is sharp.
SMUDGE FREE CONFIDENCE - Quick-drying ink means your notes stay crisp and professional—no more embarrassing smears.
EFFORTLESS WRITING FLOW - Experience a smooth, uninterrupted ink flow that glides elegantly across every page.
PRECISION FIT GUARANTEED - Designed with a 3.4mm bore diameter for seamless compatibility with select fountain pens like Hongdian.

The Asvine Fountain Pen Ink Cartridges come in a convenient 30-pack of black ink refills, each with a precise 3.4mm bore diameter tailored for compatible fountain pens like Hongdian. Crafted with neutral pH, non-toxic natural dyes, these cartridges deliver a smooth, quick-drying ink flow that prevents smudges and ensures a professional writing experience every time.

Specifications

ASIN	B08259HPC7
Best Sellers Rank	#17,818 in Office Products ( See Top 100 in Office Products ) #165 in Pen Refills
Brand Name	Asvine
Customer Reviews	4.5 4.5 out of 5 stars (11,488)
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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