Girodisc Cadillac CT4-V Blackwing Front RotorsThese GiroDisc 2 piece rotors are a direct replacement for the front rotors on the CT4 V Blackwing. Our 2 piece, fully floating assemblies help shed unsprung weight and rotating mass from the front axle of the vehicle. The rotor rings are machined from a proprietary casting made of high carbon iron formulated to GiroDiscs specifications. This superior metallurgy results in a rotor that holds up better, and the 72 curved vanes act as a centrifugal pump