Caution Safety signs have a yellow back ground with crisp sharp wording and images in black. Protected from with an anti-graffiti laminate. Signs can be pole or wall mounted. Choose from aluminum or polystyrene. An aluminum constructed sign is a great choice for displaying in a variety of settings. The robust design allows the sign to be exhibited indoors and outdoors throughout harsh conditions. The aluminum fabrication will never rust, while the anti-graffiti surface coating prevents the possibility of unnecessary defacement. A .040" thickness provides stability for long lasting life. Polystyrene signs are a valuable component to any indoor setting. The durable polystyrene .040" construction is lightweight and simple to maneuver during hanging process. Large lettering with outstanding color provides visibility from near and far distances. Printed in the USA.