The rotors that come on the Lexus have a coating of some sort on the hub that many after market rotors do not. My OEM rotors still have a gray look with no rust. I have a backup set of Bendix that I used for a short time and the hub rusted immediately. My OEM rotors came with the car in 2000. You can get after market rotors with either a gray or black anodized coating if you look. They are a little more expensive. Most shops just put on what is cheapest.