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 Centric’s 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; Centric’s metallurgical formulations are the best in the industry; consisting of G11H18 Enhanced Carbon or G12H17 High Carbon alloys; perfectly matching each vehicle’s 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. 2 Coating Types Partially or Fully coated to match OE friction type; means the right rotor for your car Road Ready From the box to your vehicle; no additional prep needed 2001 - 2009 Audi A4; 2005 - 2009 Audi A4 Quattro; 1998 - 2001 Audi A6; 1999 - 2004 Audi A6 Quattro; 2001 - 2005 Audi Allroad Quattro; 2000 - 2002 Audi S4; 2010 - 2012 Seat Exeo