The COOLER MASTER R4-S2S-124K-GP Silent Case Fan Kit (4-pack) offers a high-efficiency, quiet cooling solution for your mainstream or performance system – without a big hit to your wallet. With up to 1200 RPM of rotation speed, the 120mm case fan can produce strong airflow of up to 44.73CFM for impressive cooling performance. Operating at an ultra-low noise level of 19 dBA, it creates a quiet environment. The sleeve bearing delivers a long lifespan of 30,000 hours, ensuring maximum durability and reliability. Plus, the case fan is RoHS compliant to protect the environment.