Features: This heat sink is suitable for 540 / 550 motor of 1/10 electric RC model car. Equipped with 5V cooling fan, practical for protecting the motor from overheating. Good heat dissipation performance ensures safe and efficient work. Suitable for HSP / Redcat / AXAIL SCX10 / / TRX-4 / D90 / D110 / Tamiya CC01 1/10 scale electric RC car. With high quality materials and exquisite workmanship, it is durable and easy to use. Specification: Condition: 100% Brand New Item Type: RC Accessory Material: Aluminum Alloy + Plastic Optional Color: Purple, Black, Blue, Gold Total Size: Approx. 55 * 30 * 30mm / 2.17 * 1.18 * 1.18inch Cooling Fan Size: Approx. 30 * 30 * 10mm / 1.18 * 1.18 * 0.39inch Weight: Approx. 26g Applicable Motor: for 540 / 550 Motor Applicable RC Car: for HSP / Redcat / AXAIL SCX10 / / TRX-4 / D90 / D110 / Tamiya CC01 1/10 Scale Electric RC Car Cooling Fan: DC 5V @ 0.12A 7000RPM Package list: 1 * Motor Heat Sink with Cooling Fan Note: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please notice that the item color displayed in the pictures may be slightly different from the real object due to different monitors or other factors.