This is the New NHX 1/8 Cyclone Dual High Voltage, High Speed 28000 RPM Fan with Clip-on Heatsink. Fan features 30x30mm 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: 1/8 Motors with around 40.5 – 42.8mm diameter; 58mm length
Material: Aluminum Heatsink including Fan housing
Input Voltage: 6.0-8.4v
Fan Dimensions : 30x30x10mm
Fan Max Speed: 28000 RPM 
Fan Covers: Durable twin carbon-fiber fan guard for extra protection
Wires: Silicone wires with 240mm JST-Y Splitter with servo connecter 
Color: Burgundy