Accuform, MVHR914XT10, 18" x 12" Slow Traffic Safety Sign "Proceed with Caution" Dura-Plastic Features: Semi-rigid .060" thick polycarbonate with a protective coating Protected by UV protective coating Resists abrasion, humidity, and chemicals Service temperature range: -40° to 251°F Rounded corners and 3/16" mounting holes on most sizes, will be adjusted for larger sizes