• Complete X1 ball differential set • Direct replacement gear differential • Improves traction in low hold conditions • Enhances protection • simpler to drive • Fits X1 Complete ball differential set the X1 is direct replacement this product differential without other extra elements required without extra improvements. Using the ball differential makes the car more stable and a lot more an easy task to push, particularly in suprisingly low hold conditions like asphalt or low hold carpeting. The ball diff increases on-power steering which will be needed on all sorts of tracks.