Hi, These are really nice after-market rotors from a Spanish company called NG. 310mm diameter. The come at 5.0mm thick, and as show measured with the micrometer, they are pretty much still 5.0mm. They do have some slight surface rust and discoloration, but they are straight and in great shape. Barely used. I think they're similar in price to Brembo T-Drive rotors new; so like $700 a set. 20 three. 4 fiveeee ooonnne . eight 7 eeeeeight eeeeeight - JB