Features:This heat sink is suitable for 540 550 3650 motor of RC model car.Equipped with 4.8 6V cooling fan to protect your motor.It has perfect heat dissipation effect which can effectively the motor from overheating.The cooling fan can power up from the receiver, convenient and easy to use.With high quality materials and exquisite workmanship, it is for long term use.Specification:Condition: 100% Brand NewItem Type: RC AccessoryMaterial: Aluminum Alloy + PlasticOptional Color: Silver, Blue, Gold, PurpleTotal Size: Approx. 45 * 40 * 40mm 1.77 * 1.57 * 1.57inchCooling Fan Size: Approx. 30 * 30 * 10mm 1.18 * 1.18 * 0.39inchWeight: Approx. 53gApplicable Motor: for 540 550 3650 MotorApplicable RC Car: for 1 10 Scale Electric RC CarPackage list:1 * Motor Heat Sink with Cooling Fan