Cobra Automotive’s own custom made 12” diameter directional vented rotors are a full 1-1/4” thick vs. the stock 13/16” thick 11” ones from the factory. Thirty-six directional cooling vanes compliment these rotors' ability to dissipate heat while the special stress relieving process reduces the possibility of warping during the break in period. Made of the same high quality material used in all forms of professional racing. Also available with additional Cryogenic treatment for extra life and rotor stability. Sold individually.