Girodisc Nissan GT-R (2007-2011) 380mm Front RotorsThe Girodisc system is a direct replacement for the factory rotors on 2007 11 CBA cars. The central hat section of the disc is made from 6061 T6 aircraft specification aluminum. The disc is made from cast iron to the same specification and material as used by professional racing organizations. It is a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc. The rotor and hat have a floating mount