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These are so much fun to have an eraser in pencil form especially since pencil erasers get used up so quickly, however they aren't the easiest to get to erase, they do leave some faint lines on the paper because they are meant to not tear even thin pages so I think that's why there is some residual pencil left over. Still they work well for sketching and usually a slight line of pencil under what you erase won't matter