Adjustable Cam GearsOuter Gear Teeth Hard Anodized and Beveled For Longer Belt LifePrecision Adjustable with 12 Degrees Of Both Advance And RetardAllows Cam Timing To Be Adjusted For More Horsepower And TorqueStainless Hardware Allows Easy Adjustment And Secure LockdownMachined From High Grade 6061 T6 Billet AluminumLaser Etched Timing Marks For Precise TuningCNC Machined For Exact FitmentLightweight DesignAluminum Finish