Custom Square Car Sign Magnets - Outdoor & Car Magnets 30 Mil Round Corners are specially designed for showcasing your brand logo or business information in the outdoors. They are outdoor safe and can be stuck to cars and vans for achieving the best brand exposure. These custom magnetic signs for cars & vans are made in united states of america.. Place your order for these custom magnets today to gain lowest price guarantee, no set up fee and free design offers.