LA-1 Aluminum steel type flexible metallic conduit, the outside layer is Senior antirust aluminum strip, and the middle layer is the metal strip. It has high corrosion resistance, light in weight, good Shielding effect and artistic surface. It is mainly used in the occasions of light in weight, high corrosion resistance, non-toxic and harmless to human body, such as those special industries: food processing plants, locomotives and rolling stock. railway coach equipment piping project.