Our MaxxHaul 50503 Heavy Duty Wheel Chock is made of lightweight, heavy duty structural poly foam for a sturdy and reliable product. It includes a handle for added portability and the yellow design also ensures safety as it increases visibility. The measurement of the wheel chock is 8" x 4" x 4" and it features grooves and a rubber strip at the bottom of the chock, which maximizes grip and makes it very slip resistant.