DFC Hi-Carbon Alloy Rotor - Dimpled and Slotted - Aluminum Hat DFC 13-21 BMW M240I Coupe & Convertible Rear Dimpled & Slotted Hi-Carbon Alloy GEOMET Coated Rotor DFC Brake Rotor Engineered With Premium G3000/G11H18 Iron Castings For Strength, Stability, And Durability Original Equipment (OE) Vane Configuration To Ensure Proper And Maximum Heat Dissipation 100% Precision Mill-Balanced For Smoother Stopping And Zero Vibration At Any Speed Fined Turned Finish (16 RMS) For Improved Initial Rotor And Pad Break-In Geomet(R) Coated To Provide High-Performance Corrosion Protection Disc Thickness Variation (DTV) - 010 MM Maximum Hi-Carbon Alloy - Dimple Slot - Alum Hat Lateral Runout - 050 MM Maximum