Excellent for removing and highlighting chalks, charcoal, and Nupastels. A plastic that can be kneaded into any shape. Easy to work, not too tacky, removes marks cleanly, leaves surface smooth without depositing a film or leaving crumbs. Ink can be used over erased surface without fear of crawling. Medium size, 1-3/16" x 3/4" x 3/8"; sold in box of 24. Removes Marks Cleanly. Leaves surface smooth.