Ancor Marine Grade™ wire is manufactured from tinned copper stranding for maximum protection against corrosion and electrolysis. Black 4/0 AWG Battery Cable - Sold by the Foot. Gauge: 4/0 AWG. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm.