Team Exalt's 40mm Aluminum Fan has a Curvation design increasing the LGC and minimizing the weight with a stylish look, They are made from 7075 Aluminum and finished with Black anodizing and Gold Chamfered accents. This day in competitive racing whether its SPEC or MODIFIED the addition of a fan is typically a 30 degree difference. The lower you keep your motor temps the lower your resistance will remain thru the run, Maximizing your performance from your power package. These fans are designed to handle a voltage range that allows you to plug directly into the receiver (6.0V) or directly to the 8.4/8.7v battery providing maximum rpms out of the fan.