Outdoor & Car Magnets 30 Mil Square Corners can do really well when it comes to your brand promotion. To expose your brand to the public you need to place your brand logo and other information in an attractive fashion, also add some general signs or symbols into these customized magnets to ensure that these are aiding the customer's transportation. Request a quote to know wholesale savings for these 3x9 Custom Magnets - Outdoor & Car Magnets 30 Mil Square Corners.