Fire alarm cable : Al foil Shielded with Tinned copper drain wire , Solid copper . 18gague ,14gague,12gague, 16gague . Fire alarm cable description :Solid Copper , 22ga,18ga,16ga + drain wire + AL foil + ripcord + flame resistance PVC / LSZH / FIRE REISISTANCE PVCPackage : 100M , 305M Fire alarm cable