Tamiya Reinforced N-04/T-04 Units (Red) #15411The new T-04 unit offers more setting possibilities than the T-01 unit - FRP Multi Roller Setting Stays can be attached onto and under the T-04 unit's bumper - The polycarbonate ABS reinforced resin N-04/T-04 units provide your Mini 4WD with greater strength and durability - The included axle joints allow you to choose between normal tread, normal tread equipped with 520 ball bearings or wide tread - Includes 72mm hex shafts (2 Pcs).New in original Tamiya package.Usable with Mini 4WD PRO chassis cars