All-in-One Complete Brake Kit Replacement: R1 Concepts Brake Kit Series comes with (4) high performance brake rotors and (8) performance brake pads and hardware kit.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..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..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..Low Dust & Noise: Brake pads come with shims to eliminate noise. Low dust, asbestos free special Optimum OEp formulation provides excellent fade resistance. Top choice for front and rear brake pads replacement.