Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Pen Ink, Refills & Cartridges
Origin	-
Brand	Hero
Ink Color	Blue-Black and Pure Blue
Cartridge Caliber	3.4mm
Package Quantity	50 Cartridges
Target Audience	Elementary Students (Grade 3+)
Compatibility	Straight-Liquid Fountain Pens
Capacity Type	Large Capacity
Material	Non-toxic Plastic
Origin	China
Item Weight	120 grams

6 reviews

Anonymous

Mar 23, 2026

Rating: 5/5

Perfect for my third grader

These cartridges fit our school fountain pens perfectly. The blue-black ink is exactly what the teacher requested, and the flow is very consistent without blotting.

Anonymous

Mar 15, 2026

Rating: 3/5

Good but color varies slightly

The ink works well, but I noticed the shade of blue-black varies slightly between batches. Still usable for homework, just not perfect for calligraphy.

Anonymous

Mar 15, 2026

Rating: 4/5

Solid everyday ink

Does exactly what it says. Good for daily school use. The packaging could be a bit more robust to prevent crushing during shipping, but the product inside was fine.

Anonymous

Mar 08, 2026

Rating: 4/5

Great value bulk pack

You get a lot of cartridges for the price. The pure blue is vibrant. One cartridge had a slightly loose cap, but the rest were sealed tight.

Anonymous

Mar 06, 2026

Rating: 5/5

Reliable Hero quality

Hero has always been a trusted brand in our house. These 3.4mm cores are standard and easy for kids to swap out themselves.

Anonymous

Mar 04, 2026

Rating: 5/5

Smooth writing experience

My son loves how smoothly these write. No skipping or hard starts. The large capacity means we don't have to change them every day.

5 FAQ

Q: Can I mix the blue-black and pure blue in the same pen?

A: We do not recommend mixing different ink colors in the same cartridge or pen as it may affect the color integrity and flow performance.

Q: Are these compatible with Parker Quink style pens?

A: No, these are specifically designed for 3.4mm caliber straight-liquid fountain pens commonly used in schools, not international standard converters.

Q: What is the expiration date on these cartridges?

A: Our ink cartridges have a shelf life of 3 years from the manufacturing date printed on the box. They perform best when stored in a cool, dry place.

Q: How many pages can one cartridge typically write?

A: Depending on the pen nib size and writing pressure, one large capacity cartridge can typically cover 15 to 20 pages of standard notebook paper.

Q: Is the ink washable if it gets on clothes?

A: While the ink is non-toxic and safe for students, it is permanent once dry. We recommend washing any stains immediately with cold water.

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