Carol C2543A 18/4C Shielded Audio/Control/Communication Cable UL-2464 Gray /50ft
It has x4 18awg color-coded, premium grade SR-PVC (Semi-Rigid PolyVinyl Chloride) insulated stranded (19×30 stranding) tinned copper conductors, wrapped in a Flexfoil shield (100% coverage aluminum foil/polyester tape backing with min 25%% overlap and foil side facing out), with stranded tinned copper drain wire, all in a gray PVC jacket.