The EBC premium rotor set is offered as part of the S13 brake kit and includes rotors treated with a thermic anti-rust surface coating. In the kit context customers are shown a value saving over separate parts; the rotors are described as fully balanced and run-out tested to promote smooth braking when installed with the matched pads. It is the rotor element in the S13 kit.
EBC S13 Brake Pad and Rotor Kit