Specifications: 502 602 752 1002 1252 1502;
Structure: The trachea+Conductor+ Barrier+ Outer sheath;
Conductor: By the High purity oxygen-free copper wire;
Jacket: The use of natural rubber;
The trachea: The use of 12X1 car Yada tube, The high temperature, high pressure,high oil, high corrosion and so on.