This Staedtler Mars Plastic Rubber Eraser Pencil with Brush (526 61) is designed for precise erasing of ballpoint pen, writing, and drawing inks. It features a convenient brush end for removing eraser debris, ensuring a clean finish. The eraser pencil can be sharpened using any standard, good-quality pencil sharpener. It offers practically residue-free erasing with minimal crumbling, making cleanup easy. The eraser is phthalate and latex-free, making it a safer choice for various applications, including graphite on paper, matt drafting film, and OHP pen on overhead film. The total length of the pencil, including the brush, is 21cm.