The original factory motor is metal brush, our 55T one is carbon brush, ours is upgraded, 55T(turns) for faster speed, 88T for bigger torque, and with 11T steel pinion gear
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030 size upgraded carbon brushed 55T(Turns) motor with 11T(Teeth) steel pinion gear x1 030 size metal brushed 88T(Turns) motor with 11T(Teeth) steel pinion gear x1