This aluminum motorritzle is an original spare part by Tamiya. It is designed for various Tamiya radio control vehicles including TA01, TA02, M01, M02, M03, M04, M05, and TT02 models. This set includes 16-tooth and 17-tooth AV Pinion gears. Tamiya offers a wide selection of wheels, tires, motors, body shells, and other spare parts and hop-ups for their radio control vehicles.