"Mini 4WD Roller 11mm Ball Bearing Set" Tamiya These are parts useful for improving machine performance and setup. Ball bearings are essential as guide rollers. This set includes two 11mm outer diameter ball bearings, four brass bushings, and two mounting screws. [Specifications] ・Outer diameter 11mm x thickness 4mm Set of 2. Although it is a new, unopened item, there are traces of price sticker removal and it is sticky, so please understand this before purchasing. #Tamiya #TAMIYA #Mini4WD #Model/PlasticModel