Constructed of reinforced rubber to provide a sure grip to virtually any surface. Curved surface contours to fit tires. Rubber resists tearing, abrasion, ozone weathering, etc. Functional design is durable in all weather conditions. Series HRWC-8 is constructed of a mix of virgin and recycled, no reinforcement cords. The Airline Chock is suitable for small and large aircraft. Model HAC-13 includes a 36" polypropylene rope between two chocks. FOB Shipping Point.