All-in-One Complete Brake Kit Replacement: R1 Concepts eLine Series Brake Kit comes with (2) high performance brake rotors High Performance Brake Rotors: Made of G3000 grade cast iron with rust protection for ultimate rust protection. Built with O.E.M specifications in mind, no modification required. OEM Specifications: Formulated with G3000/G11H18 cast iron specification, these premium brake rotors are engineered to match OEM specifications for durability, reliability, and stability. Non-Directional Finish - Each rotor is prepared with a non-directional finish to promote a faster and more even disc brake pad bed-in, along with quieter and smoother stops for longer lasting, consistent braking performance. Compatible Applications for: (2012) Buick Regal GS Sedan 4-Door; Front, (2013) Buick Regal GS Sedan 4-Door 2.0L 1998CC 122Cu. In. L4 FLEX DOHC Turbocharged; Front, (2010-2015) Chevrolet Camaro SS Convertible 2-Door; Front, (2010-2015) Chevrolet Camaro SS Coupe 2-Door; Front, (2014-2017) Chevrolet SS Front, (2009) Pontiac G8 GXP Sedan 4-Door 6.2L 6162CC 376Cu. In. V8 GAS OHV Naturally Aspirated; 355mm Front & 324mm Rear Rotors; with Brembo Front Brakes;Front