Bashing your Traxxas X-MAXX or XRT hard? Those plastic drive cups can take a beating. These aluminum reinforcement rings are a must-have upgrade to prevent them from splitting or wearing out. You get a set of 4 rings (plus 8 set screws for installation) made from tough, CNC-machined aluminum. They slide right over the outer part of your stock plastic drive cups (the ones with a 17mm outer diameter) and clamp down with the screws, adding a serious layer of strength and durability. It's a simple install that can save you from a broken cup mid-jump. The red anodized finish looks cool peeking out from the axles too. Just make sure your drive cups are the original 17mm outer diameter style – these won't fit if you've already upgraded to aftermarket metal cups. A cheap insurance policy to keep your big-scale monster truck driving longer and harder. Perfect for 1/5 scale X-MAXX and 1/6 scale XRT models.