Our 12" x 24" Car magnet signs are available for birthdays to graduation, weddings to anniversaries. Our magnet sheet uses a high quality 20 mil material with a smooth surface for best color printing. Best suited for car door signage. Note: Please allow magnet to magnetize to your vehicle overnight before driving. Your magnet may detach if you do not allow ample time for magnetization.Indoor or Outdoor; Waterproof and UV safe that will last for years