Quiet, Powerful Hydraulic Bearing Fans - Cool your PC with high airflow aRGB fans packed with LEDs and lighting effects powered by Razer Chroma RGB. With high static pressure performance and lowered acoustics, the Razer Kunai is the Ideal choice for gaming PCs. Connect Up to 8 fans for an integrated setup - Daisy chain and connect up to 8 Razer Kunai fans to Pulse Width Modulation and aRGB controllers to create immersive lighting effects. Supported by Razer Synapse software for ultimate customization. PWM Fan Controller Support for Convenient Airflow Adjustments - Whether you need maximum airflow to cool your PC or run quietly at lower RPMs, Pulse Width Modulation fan controller* allows you to conveniently adjust fan speed based on your needs. *Sold separately. Powered by Razer Chroma aRGB Addressable RGB customization and game integration - Unlock ultimate aRGB customization with 16.8 million colours, light patterns, and effects which react to your gameplay. Get the world’s largest lighting ecosystem and control it from one platform. Diameter : 140mm