All-in-One Complete Brake Kit Replacement: R1 Concepts Carbon Rear Brake Kit comes with (2) high performance brake rotors and (4) low-dust ceramic brake pads and hardware kit. High Performance Brake Rotors: Made of G3000 grade cast iron with Geomet finish for ultimate rust protection. Built with O.E.M specifications in mind, no modification required. Ultimate Stopping Power: Precision-drilled holes and countersunk design prevents cracking and build up, enhances ventilation and dissipates heat. Designed for smoother and quieter stopping, built for longer lasting, consistent braking performance. Low Dust & Noise: Brake pads come with shims to eliminate noise.