The Staedtler 52855 white eraser refill is the official replacement part for maintaining the cleanliness and effectiveness of Staedtler pen-type erasers. The set includes high-quality white cylindrical eraser refills that remove pencil marks without excessive rubbing of the paper or leaving colored marks. Replacement is quick and easy. Indispensable for designers, architects, and students who use mechanical pencils and technical erasers.