Shure Trax traction control system is a safe, durable, easy to use alternative to dangerous concrete blocks and messy sand tubes. Now it's easier than ever to safely add weight to your car, truck, SUV, CUV, or van with Shur Trax vehicle traction control bag. ShurTrax is a great new product that cleverly uses water to add up to 400lbs of extra traction to virtually any vehicle.