Sewell 16 AWG Speaker Wire, 4- Conductor, CL3 Rated (For in-wall Installation), 250 ft Conduit: High Purity, Oxygen-free Copper Gauge: 16AWG Strand count: 26 wires Strand size: 0.254mm +/- 0.008 Polarity markers: Yes, inner conduits are covered by red and black jacket.