The Command Automotive SD-1 Brake Rotor has been cryogenically treated and machined and balanced on CNC equipment and break all of the sharp edges the installer may come in contact with. A multi-directional finish on the friction surface lowers break-in time. The SD-1 Brake Rotor will outlast conventional rotors by as much as 300 percent to 400 percent and pad life will be increased by 200 percent to 300 percent.