Stranded tinned copper conductors, aluminum/polyester foil shield. Drain wire is stranded tinned copper. Gray PVC jacket. Insulation: Color coded SR-PVC. Operating Temperature: -20°C to 80°C. 300 V. UL Type CM, UL AWM Style 2464, CSA PCC FT4. Foil facing out plus overall braid of tinned copper (65% coverage).