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Home / Pen Ink, Refills & Cartridges / Heat-Erasable Pen Refills Bulk Pack: Crystal Blue, Ink Blue, and Black Cartridges for Grade 3 Students, 3.4mm Universal Cores

Attributes

Brand -
Category Stationery, Educational Electronics & Office Supplies / Pen Ink, Refills & Cartridges
Origin -
Ink Colors Crystal Blue, Ink Blue, Black
Tip Size 3.4mm Universal Core
Target Grade Level Grade 3 and Up
Erasable Mechanism Heat-Sensitive Friction
Pack Quantity Bulk Pack (50 Cartridges)
Compatibility Fits Most Standard Gel Pens
Ink Type Water-Based Gel
Drying Time Quick-Dry Formula
Material Plastic Barrel with Metal Tip
Usage Scenario School Homework, Drafting, Note-Taking

6 reviews

A

Anonymous

Mar 20, 2026

Rating: 5/5

Perfect for my third grader!

My daughter loves these refills. The colors are vibrant, and the erasing feature works like a charm without tearing the paper. Great value for a bulk pack.

A

Anonymous

Mar 13, 2026

Rating: 4/5

Works as expected

The heat erasure works well with a standard eraser on the pen cap. Ink color is consistent. Would buy again when we run out.

A

Anonymous

Mar 11, 2026

Rating: 4/5

Good quality, smooth writing

The ink flows very smoothly. I bought these for my own note-taking. The only reason for 4 stars is that the black runs out slightly faster than the blue ones.

A

Anonymous

Mar 10, 2026

Rating: 5/5

Teacher approved!

I bought these for my entire classroom. Students make fewer mistakes because they can easily erase them. The 3.4mm core fits all our standard pens perfectly.

A

Anonymous

Mar 04, 2026

Rating: 5/5

No more messy correction fluid

These refills have saved us from buying correction tape. The ink disappears cleanly when rubbed, leaving no ghost marks. Very satisfied.

A

Anonymous

Mar 03, 2026

Rating: 5/5

Excellent bulk deal

You get so many refills in this pack. The crystal blue is a unique and pretty shade. Highly recommend for anyone who goes through ink quickly.

5 FAQ

Q: Can the ink be erased after a long time, or does it set permanently?

A: The heat-sensitive ink remains erasable indefinitely. You can rub the text to erase it even weeks after writing, provided you use enough friction to generate heat.

Q: Are these refills safe for young children to use?

A: Absolutely. The ink is non-toxic and acid-free, making it safe for Grade 3 students and older. Always supervise younger children during use.

Q: Do these refills fit Pilot FriXion pens?

A: Yes, the 3.4mm universal core is designed to be compatible with most major brands of erasable gel pens, including Pilot FriXion models.

Q: Is the 'Crystal Blue' significantly lighter than 'Ink Blue'?

A: Yes, Crystal Blue is a lighter, sky-blue shade, while Ink Blue is a deeper, traditional navy tone. Both are clearly visible on white paper.

Q: How many refills are included in the bulk pack?

A: This specific bulk pack contains a total of 50 cartridges, mixed across the three available colors: Crystal Blue, Ink Blue, and Black.

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