Description: Made of plastic and aluminum, CNC machining Practical and durable for protecting the motor from overheating Suitable for 42mm diameter brushless motors such as 4274, 7282, 1515 Operating voltage: 5 - 8.4V Size(L x W x H): 40 x 40 x 60 mm The color will be sent randomly (red and blue) Package Includes: 1 x Motor Heatsink with Fan Cooling