Custom car sign magnet. 28 - 28.9 sq. in. Imprints are silk-screened on 30 mil. flexible vinyl magnet material using high quality, fade resistant UV inks. Halftones are not recommended. Perfect color matches can not be guaranteed. 30 stock colors to choose from. Care instructions: Apply to clean, flat, metal surface. Once applied, we recommend moving the magnet once a week for cleaning (both the magnet and the surface). Clean magnet with soap and water.