This is the optional Ball Bearing Set for the for the Latrax Rally Car from Traxxas. FEATURES: Steel construction offers smoother operation and longer life than bushings Replaces all bushings used in the hub carriers, diff assembly, and driveshaft INCLUDES: Two 4x8x3mm Ball Bearings Eight 6x10x3mm Ball Bearings Five 8x12x3.5mm Ball Bearings