MONSTER® RC5500 GENERAL PURPOSE WHEEL CHOCKS feature a triangular design that is used by the aviation industry worldwide. They are composed of durable rubber that make them strong and safe in industrial applications. These chocks are resistant to damage from UV, moisture, salt, and oils. Their horizontal traction ribs grips the tire and road and will not cause tire or pavement damage. The chock design also allows either side to be positioned against tire. RC5500 Wheel Chocks are built to suit a variety of applications in the construction, utility, and other commercial industries.