Description: 1:10 RC Crawler, Climbing Car, Drift Car Motor Heatsink Radiator. Design with 2 Fans Cooling and Heatsink , Heat Sensitive Sensor. Suitable for 1:10 Traxxas trx-4 Motor Diameter Approx. 35-36mm. The sensor head put closely to the motor, When the motor temperature exceeds 50 degrees Celsius, the fan will keep turning. Fan Voltage: 5v-9v?max) Specification: Material: Plastic and electronic components. Size: Approx. 60 x 50 x 40mm / 2.36 x 1.97 x 1.57inch. Package Includes: 1 Piece 1/10 RC Climbing Car Motor Heatsink Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thank for your understanding