The be quiet! Shadow Wings series is comprised of eleven models with various combinations of fan size and speed. They all feature low-noise operation and high-quality rifle bearings, provide reliable cooling for up to 200,000 hours, and have anti-vibration fasteners as well as a rubberized frame that prevent the transmission of vibration. For anyone who wants dependable and quiet cooling and is looking for the ideal combination of speed and size for their PC, the Shadow Wings series is a wise choice.