Tigerchocks 3500 series aviation wheel chocks are designed for business, commercial, cargo, and military aircraft. They are an updated version of the original wooden wheel chock design. These chocks are made from impact-absorbing urethane and are resistant to oils, chemicals, fuels, and hydraulic fluids used in the aviation industry. For additional safety and convenience, Tigerchocks 3500 series wheel chocks include a 1/2″ x 24″ replaceable nylon rope lanyard and our molded-in, high visibility color for easy identification. These lightweight wheel chocks are easy to use and ideal for carrying on aircraft. Weight: 3.2 lbs. Measures 12″ length by 5″ width by 3″ height. Available in yellow color.