The design includes horizontal traction ribs that grip the road and both sides of the tire to safely keep from rolling. Come with a 30" long connecting high-performance rope, making it easier for you to chock larger vehicles including trucks trailers The specially designed curved shape of the wheel chock allows the vehicle's tire to fit perfectly on the wedge and improves grip. It is constructed of durable, solid, oil-resistant rubber, make our wheel chocks the perfect choice to keep your vehicle or trailer secure in any climate Reflective Strips: Every wheel block has 3 reflective yellow stripes to ensure high visibility even in low light conditions. These rubber chocks can be used for a wide range of purposes, perfect for Trucks, Trailers, Small Airplanes, RVs, and more to prevent your vehicle from rolling away Set of 2: Includes 2 Pack, Dimensions: 4.1" x 7.8" x 3.9"; Weight(2 Pack): 6.8 Lbs, these professional-grade solid rubber wheel chocks are great for helping you park your car