This is a pair of rotors I had replaced under warranty. They still work great; they just developed a slight pulsation. They just need to be turned slightly to true them up, or they can be used as is. I put these performance rotors all the way around on our SL2 to improve the wet braking with custom wheels, and they work very well! No more scary stops in the rain! The anodizing helps prevent rust that looks so ugly when you are running custom wheels.