The Tubing Is Produced By Wrapping Copper-Coated Steel Around Itself Twice To Form The Tubing.The AGS Standard Steel Line Has Been The Choice Of Professional Installers/Mechanics And Do-It-Yourself Mechanics For Many Years. The Entry-Level Replacement Line In The AGS Brake Line Category Is Still An Excellent Choice For Aftermarket Fluid Transfer Line Repair And Replacement. - Excellent Resistance To Rust And Corrosion - Dot Approved For Hydraulic Brake Systems - Bends And Forms Without Kinking - Available In Coils Of 25' - Finished Lines Available For Domestic & Import.