Blue Alloy Heatsink with 4.8-6V Cooling Fan for 1/10 RC Car 540 550 3650 Size Motor Product Description Note: The color of the item may vary slightly due to photography and your own computer Features: this heatsink is suitable for 540/550/3650 size motor， with a 4.8-6V cooling fan to protect your motor. The cooling fan can power up from the receiver， very easy to use. Color: Blue Dimensions of fan: Approx.1.18x1.18x0.39 inch/ 30x30x10mm Dimensions of cooling fin: Approx. 1.18x1.57 inch/ 30 x 40mm Total Height: 1.97 inch / 50mm Materials: Aluminum Alloy，plastic Weight:25g Package Included: 1X Heatsink