In answer to your question they're box store rotors. I've never had to replace a rotor unless I've had calipers freeze or fall apart and I don't notice until it's grinding metal on metal, at which point the rotor needs replaced. I've never just worn through a rotor. It's happened with each rear and I don't even know it's locked up until they start grinding. Front ones I know lock up because they'll pull and I'll replace them but the rotors are warped. I'm going to be blamed or judged or whatever for saying that but I just don't notice it in the rear. I had to replace that stuff today. The one set of pads were gone and the other side were still 1/2-3/4 life left. I don't know why my calipers lock up so bad, I drive the truck every day so it's not like they rust from sitting. Seems like the pistons shatter because the sliders still move free even after the pads are metal. The sliders are packed with grease when I put them on with ceramiglyde. My father never wore through rotors either, he always warped them towing our 32' travel trailer. I won't get mine turned because every time he tried that the warped just from normal driving. Idk but I'm not going to buy expensive rotors for that stuff to happen to them.