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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Sold byAmazon BoliviaDelivered 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 pause.
FAST DRY CONFIDENCE - Ink dries in seconds, eliminating smudges so your important notes always look sharp.
CLEAN SAFE FORMULA - Neutral pH and non-toxic natural dyes protect your pen and your health.
EFFORTLESS WRITING FLOW - Experience uninterrupted, smooth ink delivery that glides elegantly across every page.
PRECISION FIT GUARANTEED - 3.4 mm bore diameter engineered for seamless compatibility with select fountain pens like Hongdian.

Asvine Fountain Pen Ink Cartridges offer a 30-pack of black ink refills with a precise 3.4 mm bore diameter, designed for smooth, smudge-free writing. Crafted with neutral pH, non-toxic natural dyes, these cartridges ensure safe, fast-drying ink flow compatible with select fountain pens like Hongdian, making them a reliable and cost-effective choice for professionals who demand quality and consistency.

Specifications

ASIN	B08259HPC7
Best Sellers Rank	#2,619 in Office Products ( See Top 100 in Office Products ) #5 in Ink Pen Refills
Brand Name	Asvine
Customer Reviews	4.5 4.5 out of 5 stars (12,134)
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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