Optional Super duty steel internal gear set for the axial Wraith, ax10 or scx-10 transmission. Features: light weight 3 spoke design precision conk Machined 45 steel then case hardened for increased wear resistance and improved fatigue life. Replaces the stock nylon gears perfectly you will receive: all three gears (52T, 28T, 20T) requirements: removing the stock nylon gears comments: use a light amount of Silicone lubricant on the gears during installation. Compatible with all axial three-gear transmissions (Scx10, ax10 and Wraith) great for big brushless power.