The Be Quiet! Silent Wings Pro 4 PWM 140mm High-Speed Case Fan in black is a high-quality computer case fan designed for optimal cooling performance. With a fluid bearing type and a maximum airflow volume of 165 CFM, this fan ensures efficient and quiet operation. Featuring a sleek black plastic construction and a 4-pin power connection, this unit is compatible with universal brands and offers a maximum fan speed of 2400 RPM for reliable cooling in any computer case. Made by be quiet!, a trusted brand in the industry, this case fan is a top choice for those seeking efficient and quiet cooling solutions. All were bought new by me. These are amazingly quiet given the air they can push, hugely impressive! Any questions please ask.