What is this clay eraser used for and how is it different from a normal one? : r/drawing

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Got this sketching kit today, but I don't know what the grey cube

Eraser for artists - 12 pack gum eraser medium size 1 1/4 inch x 3/4 inch - white needed eraser. Kneadable erasers - our drawing eraser putty molds to

Kneaded Eraser - 12 Pack Kneaded Erasers for Artists - Erasers Medium Size Art Eraser, Kneaded Erasers for Artists, Great for Sketching, Drawing and

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