High-quality lightweight sign on .040" (1mm) sturdy aluminum substrate with enamel coating and rounded corners. No mounting holes lets you mount it the way you need. Industrial-grade adhesive mounting strips and installation instructions included. 8-year warranty by Kröghen LLC, the manufacturer. Grafkën signs are intended for use in nearly any commercial or industrial situation. We fully guarantee that our products are made using the highest standards of manufacturing. Grafkën aluminum signs can withstand harsh environments and severe weather conditions. Temperature resistance: -58 F to +230 F. Minimum life expectancy (based on outdoors, vertical placement): 12 years. Life expectancy on indoors: Almost unlimited.