uphere 5-Pack PWM 4PIN Long Life Computer Case Fan 120mm Cooling Case Fan for Computer Cases Cooling,12BK4-5

"120mm PWM controlled fan with unique 9 blades design is engineered to generate higher airflow without compromising on ultra-silent operation.High Performance:high airflow and large volume cooling by blade design,super silent.Long Working Life:Hydraulic bearing takes closed type design and loop back type lubricant supply circuit, has larger lubricant storage space and long using life, the service life is longer than 40000 hours.

High Static Pressure: Provides improved performance over standard case fans.Optimized Cooling Optimized and enhanced static pressure for better cooling performance.Hydraulic Bearing The hydraulic bearing self-lubricates with a high-quality, friction-reducing substance, which lowers operation noise while improving thermal efficiency."