The Arctic P12 PWM PST 120mm Black Case Fan (ACFAN00137A) is optimized for static pressure, making it ideal for use on heat sinks and radiators. It features a 0 dB mode for silent operation, strong cooling performance, and a more efficient motor that saves energy without compromising performance. With a maximum quietness and minimum vibration design, this fan operates smoothly and quietly, and is backed by a 6-year manufacturer's guarantee. This 5-pack includes five fans, perfect for upgrading your case or radiator cooling.