Recovered from a brand new PC case. The Lian Lee Fan is an OEM pack of four 140mm fans designed for GPU processors, featuring a maximum airflow volume of 83.5 CFM. With a fluid bearing type and a plastic material construction, these black fans offer a high maximum fan speed of 1800 RPM and a power connection of 4-pin PWM. The fans have a voltage of 5V and are compatible with universal brands, making them a versatile and efficient cooling solution for computer systems.