When you write you deposit graphite flakes on the paper. Now, when you use an eraser to rub off, these flakes are lifted off due to friction.
These pencils are perfect for erasing unwanted marks fine point erasing and also creating unique eraser effects Erases black-lead color pencils and
Faber-Castel Eraser Pencils, 2-Pack, 2 Count (Pack of 1), Multicolor
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Rite in the Rain Mechanical Pencil Eraser Refills, No.15ER
Tools On My Desk: Best Erasers for Colored Pencil — Vanilla Arts Co.