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Magnet foil expressly recommends the use only on surfaces consisting of magnetic metals. Not all metals are magnetic! Only iron, cobalt and nickel are magnetic metals. However, since aluminium is increasingly being used for the production of vehicles, you should test whether these have magnetic surfaces. In case your car does not have a magnetic surface, we recommend our car foils. These can also be removed without leaving any residue. In any case, please note the accompanying sheet for use (we put a copy in the package, here the PDF download)