Centric Premium Front Brake Rotor 2016 Mazda Miata w/o Brembo BrakesCentric premium rotors utilize an Electrocoating finish that provides long lasting corrosion protection. E coating is a superior electro statically applied finish designed to withstand 400 hours of salt water exposure without rusting. Phosphate finishes utilized by other manufacturers provide only minimal protection from the elements; these finishes are generally only effective for the shipping and storage portion of a rotors life. The addition of