Our Flaming River Professional Jumper Cables are heavy-duty, 23 feet long, and ultra-flexible. Robust brass clamps are designed to hold firm and thick, yet flexible cables allow you to safely jumpstart your vehicle. The jumper cable set comes with one black and one red cable with clamps. Conveniently stores in a rugged carrying case.Nominal Voltage: 12V/24VClamps Material: Casting BrassCable Material: Copper (cross section 50 mm2)Cable Insulation: Highly Flexible PVCMax Current Carrying Capacity: 1000 amps for 30 secondsShort-Term Current Capacity: 2000 amps for 5 seconds