Slow Children Playing Sign is on .080" Aluminum. Pre-punched 3/8" mounting holes for easy installation. Radius corners. Meets MUTCD specifications. Durable Aluminum will not rust. Designated for years of outdoor use. Can be installed onto a post, fence or wall. Slow Children Playing Sign is on .080" Aluminum. Pre-punched 3/8" mounting holes for easy installation. Radius corners. Meets MUTCD specifications. Durable Aluminum will not rust. Designated for years of outdoor use. Can be installed onto a post, fence or wall. Measuring 18" x 24".