DBA 06-08 BMW Z4 E85/E86 Front Drilled & Slotted Street Series RotorDBA's Street Series rotors feature: Kangaroo Paw ventilation 144 diamond and tear drop pillar ventilation system increases surface area resulting in greater heat dissipation This results in increased braking effectiveness and reduced brake fade, Direct replacement suitability, CBN Cubic Boron Nitride machined turned provides lower Disc Thickness Variation and parallelism resulting in less occurrence of brake shudder, Moisture proof corrosion