The Heavy Duty Bungee Strap with Galvanized Steel Hooks with Triangulated Ends to prevent hook and bungee from separating. Made from FlexaPURE®, a proprietary polyurethane material. It contains NO rubber or latex and is UV, Chemical, Fuel and Oil Resistant as well as waterproof (salt & fresh). Designed to withstand all Weather and all temperatures and can stretch up to 2x original length.