Prevent Motor From Overheating: The speed can reach up to 16000 RPM, excellent heat dissipation effect to protect the motor and extend motor’s service life. RC Motor Cooling Fans Surpass Hobby 40mm Twin Motor Fan with 5593 5692 Brushless Motor Heatsink for 1/5 1/6 RC Car 55mm 56mm Brushless Motor Update PartsFeatures:1.