Official Vehicle Decal Sets We used to use magnets (which we still provide) until one of our large event clients grew concerned about security. Magnets, after all, are easy to steal and slap onto an unauthorized vehicle. So we came up with a self-installable decal package — one large one (18″ x 18″) for the door, one small round one (6″) for the inside of the windshield. Both are easily removable without leaving adhesive residue, but not so easily as to make them casually reusable. They also stick to non-metallic surfaces, and can be used in custom configurations on non-traditional vehicles. Minimum quantity six sets of two decals at this price.