"Caution - Automatic Door" 2-Sided Decal By SmartSign | 6" Diameter DURABLE. Labels are made from Polyester and are not subject to stretching or shrinking. Labels stand up to water, cleaners and solvents. 2-SIDED. The message on the label can be seen from both sides. Labels are great for store entrances, windows or for two-sided advertising. INSTALLATION. Labels have a permanent adhesive on one side. Just peel the paper backing and stick the label. SAFETY AWARENESS. Alert everyone to exercise caution while taking some burden off your shoulders, regarding safety on your property.