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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Hongdian Cartridges

Product ID: 172094317

Details

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

⚡fast-drying ink formula

📦30-pack bulk value

🖋️3.4mm bore diameter precision

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Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

BULK BRILLIANCE - Generous 30-cartridge set keeps you stocked and ready for any project.
PRECISION PERFECT - 3.4mm bore diameter engineered for exact compatibility with select fountain pens.
SMUDGE FREE SPEED - Quick-drying formula ensures your notes stay crisp and professional.
SAFE SUSTAINABLE - Neutral pH, non-toxic ink made from natural dyes—write with peace of mind.
EFFORTLESS ELEGANCE - Smooth, uninterrupted ink flow for flawless writing every time.

This 30-pack of black fountain pen ink cartridges features a precise 3.4mm bore diameter compatible with select pens like Hongdian. Designed for smooth, consistent ink flow, the cartridges use a neutral pH, non-toxic ink made from natural dyes that dries quickly to prevent smudging. Ideal for professionals who demand reliability and elegance in every stroke.

Specifications

ASIN	B08259HPC7
Best Sellers Rank	#4,301 in Office Products ( See Top 100 in Office Products ) #16 in Ink Pen Refills
Brand Name	Asvine
Customer Reviews	4.5 4.5 out of 5 stars (12,086)
Ink Color	Black
Item Weight	0.09 Kilograms
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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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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