Wilwood's Black Satin (E-coat) motorcycle rotors provide superior corrosion resistance and uninhibited pad bedding over all conventional zinc or metallic based electro-coatings. The Satin process provides a protection layer that seals the entire microscopic surface of the base metal structure. It provides far more consistent color and thorough protection of all surfaces where zinc based electro-finishing can sometimes fall short. The Satin itself does not oxidize as is often common with zinc and other metallic based finishes. It retains its good looks long after others have failed. The brake pad contact surface gets wiped clean with the first application of the brakes to only expose the surface that will be mated to the brake pad. All other surfaces continue to retain the clean look of the Satin finish. Simply stated, Satin rotors stay cleaner longer, and perform better.