EBC's Rear Vee-Rotors utilize the same lightweight profile as the front floating rotors in the Vee-Rotors range. The perfect compliment to the EBC Vee-Rotors front. Made from heat treated stainless steel and tempered back to the optimum hardness. EBC has worked long and hard on choosing the exact correct hardness and temper procedure for their brake rotors. Under hardened rotors will wear out prematurely, while over hardened can crack over time.