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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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

Product ID: 172094317

Details

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

⚡quick-dry ink formula

📦30-pack bulk value

🖋️3.4mm bore diameter precision

KD 4.90

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Description

🖋️ Write Boldly, Refill Smartly — Never Miss a Stroke!

GLIDE LIKE A PRO - Consistent ink flow delivers an elegant, uninterrupted writing experience every time.
SAFE SUSTAINABLE - Neutral pH and non-toxic natural dyes protect your health and the environment.
EFFORTLESS PRECISION - 3.4mm bore diameter ensures perfect compatibility with select fountain pens like Hongdian.
SMOOTH SMUDGE FREE WRITING - Quick-drying ink keeps your notes crisp and professional, avoiding embarrassing smears.
BULK SUPPLY ZERO INTERRUPTIONS - Set of 30 cartridges means you’re always ready to write without running out mid-project.

The Asvine Fountain Pen Ink Cartridges come in a convenient 30-pack of black ink refills with a precise 3.4mm bore diameter, compatible with select fountain pens such as Hongdian. Featuring quick-dry, non-toxic ink with neutral pH, these cartridges ensure smooth, smudge-free writing and long-lasting supply for professionals who demand reliability and style.

Specifications

ASIN	B08259HPC7
Best Sellers Rank	#3,401 in Office Products ( See Top 100 in Office Products ) #10 in Ink Pen Refills
Brand Name	Asvine
Customer Reviews	4.5 4.5 out of 5 stars (12,099)
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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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KD 4.90

Duties & taxes included

In stock

Sold byAmazon KUWAITDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to KUWAIT.

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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