Alcon Direct Replacement Pair RotorsDerived from decades of Motorsport and racing heritage, Alcon has adapted their Motorsport brake disc technology for street and track use as a direct OE replacement ring complete with a full set of hardware for the Nissan GT R. Each iron alloy disc is vertically casted with directional vanes through Motorsport grade casting process and features Alcon's signature crescent grooved slots for a strong initial bite while continuously refreshing the brake