RSD Boss 11.8in. Two-Piece Brake Rotor - Contrast-Cut 01331800BSSSSBMDesigned specifically for use with RSD wheels Feature aluminum carrier with a 420 stainless steel outer band Available with Contrast Cut or Black Ops carriers (except 13in. Diesel polished which has a highly polished carrier) Contrast Cut carriers start with a black anodized finish that is then recut to open up the design Black Ops features gloss black on top of contrasting textured black for outstanding durability 13in. rotors use silent floaters