This is set of two 12" Magnet racing numbers. The magnetic circle is 12" diameter, not number. Numbers will be maximized within the Diameter you select. Number size depends on font and number of digits. (eg. A 1-digit number will be taller than a 3-digit number. The magnets are WHITE with your custom numbers (up to three digits), available in different fonts and colors These race numbers are made from a 30mil. magnetic Sheeting. Specially coated to prevent damage. High quality outdoor vinyl film mounted onto white magnetic sheeting. Roundel can then be quickly and easily applied, then removed If your vehicle has had any body work done to it there is a good chance that underneath the paint job could be a layer of bondo. Some vehicles components are fiberglass. Aluminum is also another alloy that magnetic signs will NOT stick too. There's a simple test, if the refrigerator magnet sticks to the vehicle, then a magnetic sign will stick to the vehicle too. We do not accept returns on custom orders unless it was a mistake on our part or an error was made by us Shipped as a kit of of 2 circular racing numbers (one each door). These high-strength Magnetic Numbers are removable and reusable. Perfect for daily-driven cars, autocross cars, and track cars. The magnets have a roundel (meatball) background with your number in the color of your choice. Perfect for daily-driven cars, autocross cars, and track cars. For Vehicle Application, please note: Must be removed and cleaned daily.