Case Fan-BLUE Wind Blocker Frame: To achieve maximum static pressure in all applications, the frame is designed to work with the CCB to reduces the blade's noise and vibration, creating a perfect balance between power and sound. Anti-vibration Mounting System: In-mold injection anti-vibration rubber pads provide hassle-free usage for 80% protection coverage, including all four corners. Twin Pack x 120mm BLUE LED Computer Case/ Radiator Fans RoHS compliance for protecting the environment 50,000 long life hours