Made of high-quality automotive-grade polypropylene. All-weather use between 32 and 131 degrees Fahrenheit. Four unique colors: blue/green/red/gunmetal/military green. Rated for vehicles up to 8,800 lbs. Ultra-lightweight at 6 lbs. each. Designed to perform well in sand/mud and light snow. Enhanced flex for maximum performance. Increases tire-to-ground contact patch.