This Tamiya factory replacement full ball bearing set is designed for the MB-01 platform and provides metal ball bearings to replace the plastic bushings or worn bearings throughout the chassis. Upgrading to a full bearing set reduces drivetrain friction and improves rolling efficiency across all rotating points in the vehicle. The set includes bearings in multiple sizes to cover every position in the build. Features: Full replacement bearing set for MB-01 chassis Multiple bearing sizes included for complete chassis coverage Metal construction throughout Reduces drivetrain friction versus plastic bushings 7/7/26 cs