Great, but run out way too fast!

I got these for my son. His handwriting was awful (normal for adhd) when he used a pencil and he wrote so lightly, it hurt my eyes to try to read it. I didn't want the teachers getting frustrated and marking off for what they couldn't decipher. These are a perfect solution! He even does math with them! They erase completely. The only reason they don't get 5 stars is because they don't last long. It would be great if they could make the refills a little bigger.

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