Product Detail Strong plastic frame with soft elastic TPE cover for maximum absorption of vibration. Special fan blade design to offer a unique visual effect when operating. Two ball bearings offers smooth rotation and extended lifetime. Low noise, maximum airflow. PWM Control . The "DeepCool 140mm Ultra Silent DC Fan with De-Vibration TPE Cover UF140" is best product for you. We recommended DeepCool 140mm Ultra Silent DC Fan with De-Vibration TPE Cover UF140