Traxxas pivot balls for the T-Maxx are constructed of hard anodized aluminum. 7075 T-6 aluminum. Optional Pivot Balls for the Traxxas T-Maxx 4WD Radio Control Monster Truck. Pivot balls are installed through the upper and lower suspension arms and axle carriers and allow camber adjustment of the wheels. This package includes, Four hard anodized 7075 T-6 aluminum pivot balls and four ball cap bushings. Requires: Installing through the suspension arms (4931) and axle carriers (4932).