MATERIAL：Racewill copper coated steel line is easy to be bent by hand and flare by simple tools.all brake line fittings are made of durable brass to prevent rust and plated for corrosion resistance UPGRADE TO 40 FITTINGS: This 25 ft brake line kit comes complete with everything you need to replace or install a new brake line system on your vehicle. RUST AND CORROSION PROOFING：Our 3/16 + 1/4 Copper coated steel line are the longest lasting brake line and much better than standard steel tubing. Copper coated brake line are ideal for vehicles experiencing harsh weather and environmental conditions MAKE DOUBLE & SINGLE FLARES: Designed to use when flaring single or double flare in a variety of material: copper, aluminu… .