... :Single conduction heating cable:1, materials: copper alloy,2, number of core: 13, screen: dual layers (copper coil shielding + aluminum foil shielding )4 ... : 220v7, Power(w/m):18Dual conduction heating cable:1,materials: copper alloy,2,number of core: 2,3,screen: single layer ... (copper coil shielding)4,sheath: high-termperaure-resistant PVC or hight ...