This sign has a durable aluminum construction and engineer grade reflective sheeting that provides adequate visibility. With its enclosed film sheeting, you can expect this sign to last for about 3-5 years. This 30" x 30" sign is extra large and offers optimum visibility. This sign has a thickness of 80 mil and has pre-punched holes so it can easily be mounted to a post or wall (mounting hardware sold separately). This sign meets MUTCD standards from the Federal Highway Administration with part number R1-1.