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 solid copper jaws are designed to fit top and side battery terminals and have a whopping 400 amp rating. The cables are a generous 14 feet in length. Made from heavy 6 gauge copper wire that is rated at 90 amps. I've used these cables regularly for the last 18 years now and they don't show any sign of wearing out! Our jumper cable bag has the correct hook-up directions printed on the front and measures 14 inches in diameter for a perfect fit. The bag is made of water resistant cordura. The cables are proudly made in the U.S.A.