Stronger Castings w/ G3500 Iron Grade compared to other standard rotors that are G3000 or less. These rotors will last longer with less chance of warping. Best quality rotors you can get any where. Split Vain Casting for even heat distribution compared to other rotors that are not. Black Electro-Coated Finish to protect from rust, also gives the rotor a 2 piece look. Maximum air circulation for increased cooling which reduces brake fade. No modification. Guaranteed perfect fitment or your money back.