EBC Brakes (VR4161BLK) Black Vee-Rotors Full floating Vee-Rotors offer an exciting new lightweight rotor with an exciting range of color options Features EBC's square sided drive button system to completely eliminate the chance of rotor warping, extend rotor life, and improve braking consistency The braking surface is 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