Brembo 08.7211.2X Disc Brake Rotor Rear HC Cast Iron. Rotor Construction: Solid. Rotor Style: Cross-drilled surface. Rotor Material: HC Cast Iron. Rotor Finish: UV-coated. Brembo 09. C828.11 Disc Brake Rotor Front For 2018-2021 Subaru WRX STi.