CNC Machined Billet Aluminum Wraith/SCX10 direct fit15T 32P Steel Pinion60T 32P Delrin SpurGear ratio Pinion/Spur ratio = 4:12 SpeedWide Steel 48 pitch internal gears1st Gear Ratio = 5.05:12nd Gear Ratio = 1.78:1Slipper ClutchShift Servo mountCompatible With Other Brand Pinions and Spur GearsEngineered by RC4WD UK Manufactured by RC4WD Slipper Clutch DesignChangable Gearing OptionsCompatible With Other Brand Pinions and Spur Gears