 For pieces rendered entirely in pencil, he employs a variety of pencil leads of varying degrees of hardness.After darkening in the construction lines that he wishes to keep, he erases the lighter ones with a kneaded eraser before rendering greater detail.For more detailed erasures, he uses a pencil-shaped white eraser, and to erase large areas, he uses a larger, hand-held white eraser, which he calls a "thermonuclear eraser", because it "takes care of everything".