Magnet-Eye Glasses Shape (3.25" x 1.375"). Keep your message in front of your clients inside and outside. Personalized with your services and contact information, an outdoor magnet is an effective marketing tool. Magnet keeps selling long after other products have been tossed away and forgotten. TuffMag (TM) magnet is 30 mil. thick and will work on cars or any other metal surface. Perfect for outdoor applications - water repellent, fade resistant and outdoor safe.