380x34mm (same as OE) curved vane rotors that can be fitted to stock calipers without any modifications. This is a direct bolt-on replacement. Black Ops rotors use cast iron discs that are all heat treated and dynamically balanced. Discs are all slotted for improved pad material transfer. Hats (center piece) are made from 6061-T6 aluminum. All Black Ops rotors are floating rotors which allow the disc to expand and contract during heat cycles with less stress to prolong rotor life. Discs are attached to hats with 10 high strength alloy steel bobbins or upgrade to our titanium hardware for increased strength and a bit more weight savings. Discs are coated with a ceramic composite coating to help prevent oxidation in areas where the disc is not in contact with brake pads. Hats are also coated in the the same ceramic composite for a consist look and uniform finish.