KO tech is the very first motor company to incorporate a cooling system to RC brusless motors that does not rely on fans or fin style designs.
The traditional fan or fin styled design calls for a fan machined in to the bell with on the inside or outside of the bell, this method has 2 major flaws. Firstly this design is "handed" meaning cw rotating motors must have a fan design orientated differently to a ccw voting motor if the fan is to be effective. Second is the fact that a fan or fan shaped spokes design robs the motor of power to drive the fan and In turn lowering response times, ultimate RPM and ultimate available torque.