The Ascot Supply Tire Testers are manufactured from rugged, heavy duty polyethylene for durability and to resist rust, dents, and other chemicals. The Tire Testers feature pyramid type ribs for extra support to prevent bowing. They are available in two styles: light truck/SUV (measuring 37-3/4” length by 18” width by 17-1/4” height) and passenger car (measuring 34-1/2” length by 14-1/2” width by 13-1/2” height).