STOP SOUND HORN PROCEED WITH CAUTION SIGN ALUMINUM 24""W X 24""H. DURABLE NON-REFLECTIVE ALUMINUM (B-555) IS A RIGID ALUMINUM PANEL WITH PROTECTED GRAPHICS DESIGNED FOR USE IN INDUSTRIAL UTILITY COMMERCIAL AND INSTITUTIONAL ENVIRONMENTS. NON-REFLECTIVE ALUMINUM (B-555) IS IDEAL FOR INDOOR AND OUTDOOR USAGE. PRINTED WITH DURABLE INKS AND CLEAR-COAT PROTECTION FOR FADE RESISTANCE. WITHSTANDS WIND RAIN SUNLIGHT AND HIGH TEMPERATURES. SIGN ALUMINUM WHITE ON RED 24 IN H X 24 IN W STOP SOUND HORN PROCEED WITH CAUTION.