30mm Aluminum Alloy RC Motor Cooling Fans,Twin Cooling Fans Heatsink for 1/7 1/8 1/10 RC Car 540 550 3650 3660 3670 Motor Compatible with:Suitable for 540 550 3650 3660 3670 Motor, compatible with1/7 1/8 1/10 RC Car scale rc car truck. Premium Material: RC Motor Cooling Fan Made of high quatity aluminum alloy,CNC machined,decent and long-lasting with great thermal conductivity. Uniquely Designed :This upgraded cooling fan adopts a dual-bearing design, and the dual cooling fans can be quickly achieved to achieve to the motor heat dissipation, to achieve the purpose of protecting the motor and extending the service life of the motor. Excellent Performance: Supports 3.5-8.4V power supply,8.4V Measured speed can reach up to 22000 RPM. Easy to Install: Dual cooling fan easy to Install. Notice: The plug is not divided into positive and negative poles, and you don' worry the wrong connection will not work.