The be quiet! SILENT WINGS PRO 4 120mm PWM is a high-quality case fan designed for optimal airflow and cooling in computer cases. With a fan diameter of 120mm and a maximum fan speed of 3000 RPM, this black fan operates quietly and efficiently. Its fluid bearing technology ensures smooth and reliable operation, while the 4-pin power connection allows for easy installation and compatibility with a variety of systems. With a maximum airflow volume of 142 CFM, this fan is a top choice for those looking to enhance the performance and longevity of their computer components.