EMPI's Stainless Steel Brake Lines are made of super tough braided stainless steel covers over Poly hose, and are D.O.T. approved - which is important in such a critical part as a brake hose. Because they are made with the stock size fittings, no adapters are needed to insure a correct fit, and it lessens the chance of leakage. Stainless Steel Brake Line Kits must be installed at all four corners, never mix rubber and stainless in the same brake system. Caution should be used when installing any new brake line. If you have any doubt about your ability to install them correctly, please let a trained professional mechanic do the job. Made in USA.