When a motor over-heated, RPM falls, car performance is negatively affected. A fast rotational speed fan is especially needed in hot summer time. New from 3Racing is version 2 Motor Heat Sink with Fan, it can grasp the motor firmly and cool down it with its 14000 rolls per minute. The weight is only 23.5 grams which is extraordinary light and can be used for few hours successively. This new part is applicable for 05 series or any 540 motors. 7 color available, choose one for your car right now.