MOO Professional Artist Erasers replace all other erasers that an artist might currently buy. MOO replaces kneaded, art gum an vinyl erasers. MOO erasers can be used to erase graphite, pastels, vine charcoal, etc. MOO erasers leave a roll of the used dirty eraser material instead of eraser dust all over the work surface and clothes of the user. MOO is the eraser that does it all without the mess! Sold as PACK OF 30.