Ebc Brakes X Series Brake Rotor Md817x The steel used in the EBC rotor blades is a special blend with higher friction effect than normal heat treated Stainless steel found on stock dics Boasts up to 10 percent improvement in friction effect improving brakes futher Brake disc design reduces weight 5 -10 percent and increases brake effect Brake disc center hubs are forged aluminum Rotor construction uses high-friction billet steel