Corrosion-resistant steel tubing like OEM on most cars. Use with our tubing bender(49002) and flaring tool(49001) to create replacement or custom lines. This corrosion-resistant steel tubing is just like the original on most cars. All you need is a tubing bender and flaring tool and you're ready to create a replacement line or even a custom one. Each kit contains 25 ft. of steel tubing (.028" thick wall) and 10 identical OEM style SAE double-flare fittings.