Bluegears b-PWM 120mm high speed 2 ball bearing fans. Translucent Black frame and Blades. 2 ball bearings Designed for high-speed high-performance fan. Better cooling and silent system performance through PWN fan speed control. 15 aerodynamic design Fan Blades for better airflow and better stability. Speed ranges from 500 to 2000Rpm with Excellent Airflow of up to 110 CFM at only 37 dBA maximum noise level. 4 pin 4 wires connector with fan speed signal output. Include a 3 to 4 pin Molex adapter for direct connection to Power Supply. 4 screws included. Customer Service: Support@bgears.com or call 702-988-6808