Top selling full circle profile OE replacement rotors. Made with tough and durable German mill rolled stainless steel heat treated to perfection and then diamond ground to micron accurate surface finish and parallelism. EBC has worked long and hard on choosing the exact correct hardness and temper procedure for their brake rotor. Under hardened rotors will wear out prematurely, while over hardened can crack over time. Delivers great brakes that will perform and last at less than Manufacturer prices.