Magnet - 2.25" x 1.3125" Round Corners - Outdoor Safe. Keep your message in front of your clients inside and outside. Personalized with your services & contact information, outdoor rectangular magnet is an effective marketing tool. Magnet keeps selling long after other products have been tossed. TuffMag (TM) magnet is 30 mil thick & will work on cars or any other metal surfaces are perfect for outdoor applications - water repellent, fade resistant & outdoor safe.