Hirschtalg (DEER TALLOW PEN) GUMMIPFLEGESTIFT (RUBBER CARE STICK) is a natural product which is odourless and best applied before Winter when the temperature is above 15°C. Ideal for making sure the rubbers around Windows / Windscreens and Hoods are kept supple and don't crack during the cold winter months or hot dry summers ! A simple, natural and effective product !