The classic from the house of Laufer, the red and blue eraser. The combination of the red runner Supra with the blue special eraser makes it a universal for office, household and school. Ideal for ink, toner, ink, pencils, crayons and copy pens. Made of rubber. Derived from the milk sap of tropical rubber trees, natural rubber is the main ingredient of these runner erasers. Thanks to their special formula, runners natural rubber erasers only form fine, dry chip, which can be easily and cleanly blown away. The blue side erases based on sharpness, the surface is slightly sanded. For example, for removing pencil cracks on wood. For school, household or professional use.