XINCOL Heavy Duty 1-Gauge Ultra 2500A 100% Copper Wire Jumper Cable Booster Cable For Truck Anti-frozon Heat Insulation Jump Leads with Free Carry Bag Size 10Ft On the basis of +15 years of Car Roadside Assistance, XINCOL brand founder Jack Guo invented This Professional Jumper Cable After He Had Tried Hundreds of Useless Poor Quality Thin Jumper Cables. It is No.1 Choice of Professional Car Dealership and Vehicle Rescue Personnel. Including 1 AWG 100% Copper Wires, thicker Wires with Super Good Conductivity. Withstand thermal changes and much safer than those of aluminum cables. TPR material on the outside of cable, low temperature resistance (-60C/-105C), soft and flexible in extreme cold weather with excellent heat insulation feature and Dual Construction and Extra Strong-Grip Heavy duty copper-coated jaw clamps VERSATILE JUMPER CABLE with optional variable length(10ft-20ft) designed to work in all weather climates. Perfect for cars, motorcycles, trucks, vans and SUVs. Warranty 100% Jump-start Success (Make Sure Of Correct Operation Connection and Normal Battery)