telephone line cord: Telephone wire, indoor/outdoor, telephone cable Inner Conductor: TC, CU, CCA, CCS, telephone line cord: Inner Conductor: TC, CU, CCA, CCS,number of core: 2 , 4diameter: 0.4mm,0.45mm,0.5mmInsulation: PVC or PE Sheath: PVC or PE Color: White, Red, Gray, Ivory, Brown, etc