A. Nozzle, where the film layer is sealed at a high temperature above 800℃, it is inevitable that part of it will fall off. The high temperature special effect tube is only about 1 cm long without film due to high temperature resistance, while other tubes are not resistant to high temperature, and the film peeling off is about 2.5 cm in length.
B. Color of inner tube: Observed by naked eyes, the inner tube color of high temperature and alpine tube is dark red (because the bottom layer of the film is copper); while the high-efficiency tube and ordinary tube are white (because the bottom layer of the film is aluminum).
