If NASA Designed a Computer Case Fan – This Would Be It Corsair ML Series of PWM fans magnetic levitation technology and custom engineered rotors provide unrivaled performance and low noise Thanks to its innovative design the ML Series fans delivers both high static pressure and high air flow for a superior fan experience. Magnetic Bearing Harnesses magnetic levitation technology to provide lower noise higher performance and a longer lifespan. Custom Rotor Design Delivers the perfect balance between high static pressure and high airflow operating flawlessly in the most challenging environments Extensive Control Range A 1600 RPM PWM control range gives you total control between low noise and absolute performance. With a 1600 RPM PWM control range The ML Series fans deliver total control between low noise and airflow without compromise. Contents and Specifications . Package contents (x2) ML140 140mm PWM Premium Magnetic Levitation Fan . Fan mounting screws System Requirements Motherboard with an open standard 4-pin fan connector .