THE JQRacing Aluminum Rear Hub (Left) include one CNC aluminium rear hub, two plastic spacers, and the two M4 grubscrews needed to assemble it. We released these CNC Aluminum Rear Hubs because they are stronger and more tunable than the stock plastic hubs. The upper link holes are one row higher than on the plastic hub, so the 2nd highest row is the same as the plastic hub top row. The new top row makes THE Car smoother in corners, and helps THE Car keep a more consistent arc through corners. Also, the hub requires 4 plastic spacers to fit in the arm, with 2 in front, and 2 behind being the stock position. This means that compared with the plastic hub, these can be moved 2mm further forwards for even more rear traction, or backwards for high traction tracks. We also offer this part in Gold, JQB0239