RoofPax 6 Rooftop Cargo Tie Down Hook Straps are designed to secure any car top cargo without the need for a car rack. These waterproof hooks attach to the car door frame and are universal to fit most car models. Made of Nylon, Polyester, Silk, and Steel, they provide a safe and waterproof solution for tying down cargo. The product comes with a lifetime warranty on breakage or tear.