Milspec 15' Pro Power SJTW Extension Cord, 12/3 AWG, Black Milspec 15Ft 12/3 15A-125V SJTW Outdoor Extension Cord. Each of the 3 conductors contain 65 strands of 30 gauge 100% copper wire for reliable amperage transmission. SJTW thermo vinyl cold weather compounded jacket guarantees the cord will remain flexible in temperatures below freezing. Jacket resists oil, grease and ozone, and features an F2 rating for flame resistance. UL and cUL Approved