The SickleFlow 120 series fan features light-brown transparent fan blades for better LED effect. A Long life sleeve bearing provides improved life expectancy. The improved CFM better fortifies your PC's cooling capabilities. This fan is RoHS compliant for protecting the environment.The Cooler Master R4-L2R-20AR-R1 R4 Series Case Fan, with its dazzling red LED design, fits into any 120mm port in your chassis. Not to mention, the Cooler Master R4-L2R-20AR-R1 R4 Series Case Fan also features 50,000 hours of operation.