These are the Optional Pivot Balls for the Traxxas T-Maxx 4WD Radio Control Monster Truck. These pivot balls are installed through the upper and lower suspension arms and axle carriers and allow camber adjustment of the wheels. FEATURES: Replace stock pivot balls with these hardened heavy duty versions. Constructed of 7075 T-6 aluminum. INCLUDES: Four hard anodized 7075 T-6 aluminum pivot balls. Four ball cap bushings. REQUIRES: Installing through the suspension arms (4931) and axle carriers (4932).