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How to Choose Magnet Sign Size

The most-popular sizes for vehicle magnets are 12" x 18" for compact cars and 12" x 24" for regular size passenger cars. Pickup trucks and SUVs can accommodate larger magnets, with 18 x 24” being very popular. With the largest area of all passenger vehicles, 24 x 36” is a popular size for van magnets and some vans can handle sizes up to 24 x 48”.

One common mistake people make in ordering their car magnets is to assume that "one size fits all" or to simply guess at the dimensions. Not all car doors are designed the same way or with the same construction materials. Car magnets should be ordered at custom sizes to ensure the best fit on the vehicle. If car magnets are placed over trim moulding or on a curved area, the resulting airflow can weaken the bond between the car and the magnet. Always measure the flat, metallic surface area you wish to utilize for your magnetic signs before you order. This is strongly recommended and is the best way to pick the size of your car magnets.