PLAST SOFT - eraser. The Läufer specialist erases gently without harming the paper. Its special formula makes it very soft, making it making it extremely gentle on surfaces. The formula for the Läufer Plast Soft is tailored to pencils and crayons. white, soft plastic eraser. erases quickly, cleanly and without smudging. is gentle to paper and does not harm writing and drawing ink lines. also erases overhead projector transparencies.