To protect the stem surface, the product is fabricated by braiding flexible, continuous filament carbon yarn impregnated with a special lubricant containing corrosion inhibitor molybdenum into the lattice and then graphitized on the surface to prevent gas / liquid from leaking or seeping. It has excellent heat resistance and chemical resistance. It has a long life and stable performance. Therefore, it is widely used in various valves under high temperature and high pressure, and in rotary and reciprocating machines.