Product Type: Outer PVC coated, inner flexible GI steel conduit for wire protection Product Features 1, The flexible inner core is made from spiral wound hot dipped galvanized plated steel. Size 3/8 `` through 1-1 / 4 '' contains copper wire per UL requirement. Larger sizes are fully interlocked. Jacket is flexible PVC ..   2, It's widely used in the wire safety protection in industries including railways, automation, transportation equipment, aerospace, machinery and other areas where flexibility and exposure to High or Low temperature exit.