Part Number 61431; 16/4C Stranded Bare Copper (65x34 OFHC) Oxygen Free & Halogen Free. Unshielded Direct Burial Speaker Outdoor Audio Wire. c(ETL)us CL3, CM, FPL/PLTC Sun Res CMH, FT1. 300 Volts Power Limited. Applications: Outdoor Direct Burial, Buried, Speaker, Audio, Security, HVAC, Access Control, Card Access, CCTV Power and Commercial Applications. All of our Wires & Cables are made in the USA.