High-impact orange urethane material Light and heavy duty use Use chocks for light duty and heavy Meets NFPA & SAE Specifications Durable, light weight, and easy to use - Extensively field tested Tire Size: 27" to 32" (685 mm to 812 mm) Dimensions (LxWxH): 10" (250 mm) x 8" (200 mm) x 6" (150 mm) Weight: 2.8 lbs (1.3 kg)