
I write a lot of equations and make a lot of mistakes. I also press really hard when I write, so I have to press really hard when I erase. The eraser of other useless erasers/sharpeners breaks easily when I try to erase, but this one is quite durable. Also washes very effectively. The sharpener is also of good quality. The small plastic window cracks quite easily under strong pressure (which can happen accidentally with a backpack), but holds pencil shavings well even with a tear.

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