This might be an optional rotor for Racing Performer M3 show engines which allows one to adjust the ability feeling according to battle laws. With a magnet outer diameter of 12.0mm and inner diameter of 7.25mm, it uses a high-power magnet that achieves overwhelming acceleration and top speed, providing you an advantage in races. even when the magnetic force is lost as a result of high conditions, you are able to recharge the engine power by changing the rotor! It is possible to regain your initial energy and feeling.
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