Heavy Duty Safe UL 6 Gauge Cables: Tinned copper wire has good electrical conductivity, thermal conductivity, stability, tin-plated copper can increase heat disation, improve electrical conductivity and improve wire performance. Red wire is positive while black is negative. Tin-plated Copper Terminal: Tin-plated copper has good stability, wear resistance, corrosion resistance, which improves the oxidation resistance of copper and maintains its conductivity better. PVC Insulated Jacket: Flexible PVC insulation of battery cables resists abrasion, waterproof and moisture proof, flame retardant and heat insulation, and withstands the rigors of an automotive or marine environment. Scope of Application: 6 gauge inverter cables are often used for power application in automotive, truck, marine boats, solar, RV, trailer, golf car, motorcycle, mower, etc. Package Includes: 20-inch 6AWG battery inverter cables contain a set of positive(red) and negative(black) battery cables.