The GoodAll 14-252 commercial booster cables are 25-ft. long and made of 2-gauge all copper wire.  The cable has a twin extruded jacket for durability, and remains flexible to -40ºF.  The clamps are vinyl coated to prevent shorts, and feature replaceable jaws to ensure the long life of the jumper cable set.  Rated at 500 amps, these jumper cables are appropriate for up through heavy duty boosting.  Individually boxed.