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 prevent 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 durable for long term use. Specification: Condition: 100% Brand New Item Type: RC Accessory Material: Aluminum Alloy + Plastic Optional Color: Silver, Blue, Gold, Purple Total Size: Approx. 45 * 40 * 40mm / 1.77 * 1.57 * 1.57inch Cooling Fan Size: Approx. 30 * 30 * 10mm / 1.18 * 1.18 * 0.39inch Weight: Approx. 53g Applicable Motor: for 540 / 550 / 3650 Motor Applicable RC Car: for 1/10 Scale Electric RC Car Package list: 1 * Motor Heat Sink with Cooling Fan