My Security Sign aluminum rectangle shooting range warning sign, legend "IF YOU CAN READ THIS, YOU'RE IN RANGE". These rugged signs are made from heavy-duty, 63 mil thick aluminum. Unlike steel signs, our aluminum signs do not rust. Signs are printed with 3M screen printing or 3M outdoor digital inks designed specifically for outdoor traffic and parking signs - for the ultimate in durability. They should last up to 10 plus years outside. Signs have rounded, burr-free corners, for longer life and a professional appearance. Compare with lower costs signs that use a lower cost and often hazardous square corner. Thick 63 mil signs do not bend. They have been proven to outlast the toughest of storms. Signs have large holes for easy mounting. The holes are "cleared" unlike competitors' signs. It has great water and chemical resistance. Sign lasts 10 plus years outdoor life. Great water and chemical resistance. Typical maximum temperature 168 degree F. Mounts with screw or clips. Measures 12-inches width by 18-inches height. White on green color combination.