The Tamiya 1150 Sealed Ball Bearing Set (2Pc) is a hop up part for a Tamiya Radio Control Car. Ball bearings are an ideal first step to tune your model, providing more efficient power for a longer-lasting, smooth drive. Outer diameter: 11mm Inner diameter: 5mm Thickness: 4mm Compatible Chassis:DF-02, DF-03, DT-02, DT-03, DT-03T, F103GT, F104 Ver.II PRO, M-05, M-05 PRO, M-05 Ver.II PRO, M-06, M-06 PRO, M-07 Concept, M-08 Concept, MF-01X, RM-01, TRF101, TRF102, TRF103, TT-01 Type-E, TT-01 Type-ES, TT-01D Type-E, TT-02. TT-02B, TT-02D, TT-02 Type-S & TT-02RR Chassis Manufacturer: Tamiya Model: 53029 1150 Sealed Ball Bearing Set (2Pc)