Outdoor & car magnets 30 Mil square corners will help you easily drive your campaign around the town. If you have been wondering how it will survive the tough large expectations pinned on banners or billboards lining the streets? We should tell you that these rectangular magnets possess UV coating, which makes it water and fade resistant. Additionally, it comes with a super magnetic hold, which means it will remain over the car bumper or car door for a long time.