4000 series: DBA's mid-series enhanced performance rotor features Thermal Stability Profiling for improved heat handling, Thermo-Graphic paint markings for effective heat monitoring and Kangaroo Paw ventilation design for efficient braking. The 4000 slotted has a unique 6x6 Wiper Slot design for extreme stopping power on road and track. The 4000XS, with cross-drilling and slotting, is DBA's premium one-piece rotor for street use.