Amateur Ham Radio Custom Call Sign License Plate, Car Tag, Novelty Plate. This is a new plate made from aluminum for durability and the logo is made from high-grade vinyl, suitable for indoor or outdoor use and measures 6" tall by 12" wide (standard US plate size). Plates are black in color and the graphics are customizable in color. If you have any questions or don’t see what you are looking for please contact us. Amateur Ham Radio Custom Call Sign License Plate, Car Tag, Novelty Plate. This is a new plate made from aluminum for durability and the logo is made from high-grade vinyl, suitable for indoor or outdoor use and measures 6" tall by 12" wide (standard US plate size). Plates are black in color and the graphics are customizable in color. If you have any questions or don’t see what you are looking for please contact us.