Features: brand new and high quality This RC motor heatsink is specially designed for 540 550 motors of RC model car. It will make your RC car even cooler and give it a new look. The RC heatsink with thermal sensor is equipped with double cooling fan to protect the motor from overheating efficiently. Design with strong wind and high speed of rotation, can effectively reduce the engine operating temperature. The cooling fan can be powered up from the receiver. And it is also easy to install and saves for time and effort With high quality alloy material designed clamp shape andexquisite workmanship, the heatsink is durable for long term use. Specifications: Material: Alloy Color: Black/Silver/Red/Blue Size: Approx. 30x60 mm/ 1.18x2.36 inches Package Includes: 1x Double Cooling Fan Heatsink note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.