Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Pen Ink, Refills & Cartridges
Origin	-
Brand	HERO
Ink Type	Thermally Erasable
Available Colors	Blue, Black, Blue-Black
Compatible Nib Sizes	3.4mm and 2.6mm
Package Type	Bulk Pack
Target Audience	Students (Grade 3+)
Erasure Method	Heat Friction (Pen Eraser)
Cartridge Material	Plastic
Origin	Official Flagship Store
Usage	Handwriting Practice & Daily Writing

6 reviews

Anonymous

Mar 29, 2026

Rating: 3/5

Works but fades in heat

The erasing function is cool, but be careful leaving your notebook in a hot car. I noticed some writing faded slightly. Otherwise, it's good for school use where temperatures are controlled.

Anonymous

Mar 22, 2026

Rating: 5/5

Exactly as described

Fast shipping from the flagship store. The cartridges fit both my 3.4mm and 2.6mm nib pens without leaking. The blue-black color is sophisticated and unique.

Anonymous

Mar 18, 2026

Rating: 5/5

Perfect for my third grader!

These cartridges are a lifesaver for handwriting practice. My daughter makes mistakes often, and being able to erase them cleanly without tearing the paper is amazing. The blue ink is vibrant and easy to read.

Anonymous

Mar 14, 2026

Rating: 4/5

Great for learning

My son loves that he can fix his letters instantly. It has boosted his confidence in writing. Only giving 4 stars because I wish the pack came with more blue-black options.

Anonymous

Mar 06, 2026

Rating: 4/5

Good value bulk pack

Bought these for our homeschool co-op. The bulk pack lasts a long time. The erasing works well, though you have to rub firmly. Fits our HERO pens perfectly.

Anonymous

Mar 05, 2026

Rating: 5/5

Smooth writing experience

I was worried erasable ink would feel scratchy, but this flows very smoothly. The black color is deep and professional looking. Great for drafting notes before finalizing them.

5 FAQ

Q: What grade levels are these best suited for?

A: While suitable for all ages, they are specifically marketed for Grade 3 and up to assist children who are still mastering handwriting and need to correct mistakes frequently.

Q: Can I buy just the blue-black color separately?

A: This specific listing is a bulk mix pack. Please check our store catalog for single-color refill packs which may be available individually.

Q: Is the ink waterproof before erasing?

A: No, like most erasable inks, it is not waterproof. We recommend allowing the ink to dry completely before handling to prevent smudging.

Q: Do these cartridges work with non-HERO fountain pens?

A: These are designed specifically for HERO fountain pens with 3.4mm and 2.6mm nib interfaces. Compatibility with other brands is not guaranteed due to varying cartridge dimensions.

Q: How exactly do you erase the ink?

A: The ink is thermally erasable. You simply use the friction eraser on the end of a compatible HERO pen or apply gentle heat to the written area to make the ink disappear.

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