The heavy duty gearbox delivers extra durability to your drive train for less wear and tear and helps reduce maintenance - the alloy construction insures the drive shaft gear maintains solid teeth engagement against the diff gear to eliminate the problem of worn gear teeth and poor gear mesh due to the stock plastic gearbox flexing. Beautifully polished and anodized in our gun metal finish for easier visibility and the performance vehicle look. Sticker sheet included. Requires the Losi Super Baja / Super Rock Rey. High quality hobby grade hex wrenches are always recommended for longer lasting hardware and easier assembly.