Wheel chocks are designed to prevent accidental movement and are placed for safety in addition to setting the brakes. Constructed of reinforced rubber to provide a sure grip on virtually any surface. Curved surface contours to fit tires. Rubber resists tearing, abrasion, ozone weathering, etc. Functional design is durable in all weather conditions. 9-1/4"W X 6"H X 8"D. 11lbs.