This is the New NHX 1/5 Cyclone Dual High Voltage, High Speed 16000 RPM Fan with Clip-on Heatsink. Fan features 40x40mm Aluminum heatsink housing with carbon-fiber fan guard for extra protection. Silicone lead wires provide extra protection against heat. A handy 240mm extension is simple to install by plugging directly into your receiver where it operates off BEC voltage. Because they feature HV compatibility, they can also be soldered directly to ESC battery terminals when using 2S batteries to achieve maximum RPM and cooling. Installing in the vehicle is as easy as snapping the heatsink on to the motor and connecting the JST-Y Splitter with servo connecter for easy installation! Features: For: 1/5 Motors with around 55�57mm diameter Material: Aluminum Heatsink including Fan housing Input Voltage: 6.0-8.4v Each Fan Dimensions : 40x40x10mm Each Fan Max Speed: 16000 RPM Fan Covers: Durable twin carbon-fiber fan guard for extra protection Wires: Silicone wires with 240mm JST-Y Splitter with servo connecter Color: Green Note: Motor shown is for illustration purpose only.