The Thermal Take Extreme Volcano 12, Silent Boost K8, and Silent 775D CPU fans by Thermaltake and Evercool are designed for universal compatibility with NVIDIA VGA cards, ATi cards, Socket 939, Socket A, Socket 775, and Socket 754. These fans offer a variety of colors, bearing types, and maximum airflow volumes to fit a variety of computers. With a focus on quality, the fans are made of aluminum, plastic, and copper materials and the EverCool(EC) nighthawk comes with a red fan light color. The package includes 4 units in a box, and the fans have a variety of power connections and maximum fan speed settings. Ideal for cooling systems, these CPU fans provide efficient and effective cooling performance.