Feature:1. Made of aluminum alloy and plastic, with fan cooling and stainless steel protective mesh cover.2. Replacement of motor cooling fan for 1:10 RC car 540 3650 3660 3670 motor.3. Suitable for 36mm outer diameter motor, ball fans, large heat dissipation.4. Life expectancy is more than 3 times than ordinary fans, long endurance.5. There are 6 different colors available, you can choose by your needs.Specification:Condition: 100% Brand NewItem Type: Heat Sink CoolerMaterial: Aluminum Alloy, PlasticOptional Color: Black, Blue, Red, Purple, Gold, Silver Applicable Motor: Brush 540/550, Brushless 3650/3660/3674/3670, motor with outer diameter of 36mm can be used.Fan: Approx. 4 x 4 x 1cm / 1.6 x 1.6 x 0.4in Large FanBall fans, large heat dissipation, life expectancy is more than 3 times than ordinary fans.Package List:1 x Heat Sink Cooler