GCx and the new GCx FC Disc Brake Rotors are specifically engineered to match OE performance and provide superior protection from rust and corrosion. Coated with Centrics advanced RS200 finish on all non - mating surfaces GCx premium rotors deliver extended life and great looks over the life of the vehicle. What makes GCx application specific Coating pattern GCx coatings are applied in two patterns. Each pattern compliments the brake pad friction type. Rotor Metallurgy Centrics metallurgical formulations are the best in the industry consisting of G11H18 Enhanced Carbon or G12H17 High Carbon alloys perfectly matching each vehicles OEM metallurgical profile. Centric ensures you get the perfect rotor for your car every time. With over 1000 SKUs and growing you are covered for more than 98 of the vehicles on the road today.