"This 2-pack of heavy-duty Ironton Aircraft Wheel Chocks is designed for use chocking the wheels of aircraft or ground equipment, or for anchoring large pipe. Tough ribbed rubber construction. Includes qty. 2, Reflective Yes, Rope Length ft. 3, Length in. 18, Material Rubber, Height in. 5 1/2, Working Width in. 6 1/8. Reflective tape on 3 sides for high visibility 3 ft. nylon rope connects the pair of chocks to provide easy, safer removal 18 in. L x 6.1 in. W x 5.5 in. H large size chocks"