Counter-balanced magnet reduces axial tension on the bearing Vibration dampening corners Made from sturdy high-grade glass-fiber-reinforced thermoplasticpolymer Fan geometry optimized for excellent airflow Aerodynamic thin stator struts reduce noise output Strategic blade notches diffuse noise from blade/stator interaction Trip Wire technology reduces blade turbulence Powerful motor reliably maintains stable speed Included PWM Y-cable connects two fans with a single PWM header Available in 120mm and 140mm fan sizes