Yokomo Y2-500AA Aluminum ball diff kit for YD-2 series  [Y2-500AA]

That is a ball differential set you need to use for many YD-2 show cars.
The left and right differential housings are constructed with aluminum, ultimately causing a lightweight finish. While taking advantage of the high traction attribute of a ball differential, it has many benefits, like enhanced throttle reaction due to its light-weight and enhanced maneuverability by reducing the gyroscopic effect.
so that you can minmise use within the aluminum elements, a resin protector is attached to the dogbone tip regarding the universal shaft, optimizing approval and additional increasing response.