Cooler Master Sleeve Bearing 120mm Silent Fan for Computer Cases, CPU Coolers, and Radiators (Value 4-Pack) Higher air flow to enhance cooling performance Ultra silent operation at 19 dBA Economic solution for perfect performance RoHS compliance for protecting the environment 4 IN 1 Value Pack Higher air flow to enhance cooling performance Ultra silent operation at 19 dBA Economic solution for perfect performance RoHS compliance for protecting the environment