The Guardian Extreme manufacturing process fuses graphics into rugged, industrial grade polypropylene to make the longest lasting signs available. This permanent fusion process makes them very rugged and able to withstand frequent cleaning, high humidity and temperature ranges from -50 F to +220F. They can be use either indoors or out door and will stand up to sun, rain, sleet windborne sand and dirt. They are also extremely chemical resistant being resistant to over 30 chemicals. Sign measures 14-inches high by 20-inches wide.