gold silver wire one core is Oxygen Free Copper ,the other core is tinned copper, silver silver wire two core are of tinned copper,with Clear PVC Jacket, Flexible Full 30 American Wire Gauge, Each Conductor in 9 Strands of Copper (0.1mm) Come in One Continuous Length, High Purity, Low Signal Loss High Resistance to Heat, Oil, Chemicals and Abrasion, Low Electric Resistance wire legth : 328 feet /roll (100meter) Perfect for do-it-yourself projects or home repairs