The rubber coated magnets are high strength rare earth magnets with a durable rubber coated to protect sensitive surfaces like painted cars, bikes, or any highly finished surface. They give great durability and high friction to keep them from slipping on surfaces. Rubber coated mounting magnets sometimes feature a central threaded hole so that you can attach them with a bolt. Alternatively you can insert a hook or eye bolt. The protective rubber coating protects magnets from liquids and corrosion or oxidation for sustained use in outdoor environments.