Description
Reviews
| 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 |
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.
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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