... -20cores 3) Dielectric: PE, PVC, PP. Security alarm cable 4 cores unshield Alarm Cable / Security Cable / Control Cable1,Conductor Materials:BC ... Clad Steel;2, Structure 1) Cent Conductor: TC, BC. 2) Cores: 2-24 pairs3) Dielectric: PE, PVC, PP. 4) Shield: Al ... , 200yard/roll, 300yard/roll. 2) Inner packing:Roll, Wooden reel, plastic reel, and paper reel. 3) Outer packing: Carton box, pull out box ...