Plastic erasers, specially designed to remove graphite from tracing papers and films. A non-abrasive and self cleaning eraser, it removes graphite lines without ghosting.? The easy-to-cut plastic also allows it to be used as a carving block.?Cut fine details and crisp, clean outlines. Material does not crumble, is smudge resistant, yet cleans easily. Surface is ideal for ink pads, watercolor markers, printmaking inks, acrylics, embossing and glue pads. Eraser blocks can be carved on the front and back, plus each of the four sides, making them an exceptional value. 24 per package, each measures 2 x 1 x 1/3".