It's A Pit Bull Thing You Wouldn't Understand - Bone Magnet can be used both indoors and outdoors. Place magnet on the back of a car or inside on the refrigerator. Magnet is printed on a full color fade resistant .25 mil thick vinyl magnetic material. This magnet also has a special backside coating that resists adhering to the paint on your car. (StickerShoppe.com still recommends removing magnet weekly and clean area). Magnet is proudly printed in the USA.