This is the Yeah Racing 30x30x10mm Aluminum "Tornado Plus" High Speed Cooling Fan. This fan features a full aluminum case to help dissipate heat in hot conditions. Plus, the aluminum case helps to improve durability as well. dual ball bearings and is great for motors, ESC's and multiple other applications. The case has a small relief in the side to allow the fan case to sit flush, and the board is exposed to allow easy re-wiring. Plus, this fan is capable of 2S LiPo (8.4V) operation!