Cooler Master Mobius 120 OC High Performance Interconnecting Ring Blade Fan, PWM Fan Speed Toggle, Metal Motor Hub, Double Ball Bearing for PC Case, Liquid and Air (MFZ M2NN 32NPK R1), Black

Ring Blade Design (RBD): Interconnecting fan blades designed for a reinforced and rigid structure, eliminating vibration for stable and fluid fan operation. Anti-Vibration Rubber Mounts - Patented corner mount design dampen vibration and rattling while maintaining chassis stability for silent operation. Fan Speed Cable Toggle - Built-in variable speed cable control easily adjusts fan RPM ranges for a wide versatility of cooling applications. Metal Motor Hub - Center motor hub constructed with metal for reinforced stability to deliver superior fan performance. Double Ball Bearing - Double ball bearing minimizes friction for quiet operation and exceptional lifespan.