... Single conduction heating cable:1, materials: copper alloy,2, number of core: 13, screen: dual layers (copper coil shielding + aluminum ... 18Dual conduction heating cable:1,materials: copper alloy,2,number of core: 2,3,screen: single layer (copper coil shielding ... with medical principle of traditional chinese medication.3,Eco-friendly, no emissions, populations or noise occur during it working in line ...