What makes a great jumper cable is the clamp. Ours are made of tough, ABS plastic and won't spark or short when accidentally touched to an engine block. They're also big and durable. The jaws are designed to fit top and side battery terminals and have a whopping 400 amp rating. These cables are a generous 14 feet in length, which should take care of all of your needs. Made from heavy 6 gauge copper wire that is rated at 90 amps. I've used these jumper cables for the last 18 years now and they don't show any sign of wearing out! Cables are made in the U.S.A.