1)4 cores 2)Bare copper or tinned copper or CCA or CCS ... security system, internal connecting sensors, control panels Shielded/Unshielded Alarm Cable: 1> Conductor: Bare copper or tinned copper or CCA or ... CCS conductor are available 2> Insulation: PVC-flame proof 3> Cable cores: 2, 4, 6, 8, 12,...,50 are available 4> Shield ...