This is the New NHX 1/8 Dual High Voltage, High Speed 15000 RPM Fan with Side Mount. Fan features 40x40mm Aluminum heatsink housing with Aluminum fan guard for extra protection.  Silicone lead wires provide extra protection against heat.  A handy 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 onto the motor and connecting the JST-Y Splitter with a servo connecter for easy installation!  

Features:
For: Castle 2028 or 56mm diameter motors
Material: Aluminum Heatsink including Fan housing
Input Voltage: 5-8.4v
Fan Dimensions : 40x40x13.5mm
Fan Max Speed: 16000 RPM each Fan
Fan Covers: Durable twin Aluminum fan guard for extra protection
Wires: Silicone wires with JST-Y Splitter with servo connecter and also includes 2s direct Lipo connecter 
Color: Black