Cooler Master Excalibur 120mm PWM Computer Case Fan (R4-EXBB-20PK-R0) The innovative Barometric Ball Bearing technology provides longer life span while remaining lower noise level. PWM function for total performance solution at high and low speed operation. Fan Size 120mmBearing Type Barometric BallRPM 600 - 2000 RPM10%Air Flow 26.4 - 85.6 CFM10%Noise Level 13 - 30 dBAPower Connector 4 Pin Removable blades for quick and easy cleaning. Nine massive sword-shaped blades generate outstanding high air pressure with balanced airflow. Triangular blade tips reduce turbulence at fan edges and decrease wind shear noise while keeping maximum sweeping area.