All-in-One Complete Brake Kit Replacement: R1 Concepts Carbon Series Brake Kit comes with (2) high performance brake rotors (4) performance brake pads and hardware High Performance Brake Rotors: Made of G3000 grade cast iron with zinc 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. Low dust, asbestos free special Ceramic formulation provides excellent fade resistance. Top choice for front and rear brake pads replacement. Reliable Street Performance: Diamond slotted design increase brake pad bite, extends brake pad life and serves as a rotor wear indicator giving you a heads up before your next replacement.