... ,2, number of core: 13, screen: dual layers (copper coil shielding + aluminum foil shielding )4, sheath: high-termperature-resistent PVC or high-temperature-resistent ... ,2,number of core: 2,3,screen: single layer (copper coil shielding)4,sheath: high-termperaure-resistant PVC or hight temperature-resistent ...