Work with Creality K1/ K1 Max/ K1C/K1 SE 3D Printers Extruder Nozzle Fan.High quality Dual Ball Bearing - Balance between high air volume and low noise, Suitable for 24 hours / day long-term work, long life: 50,000 Hours.Feature - Strong Wind Force and Low Power Consumption，Multi Fan Blades with Fluid Design，Excellent Cooling System.After-sale Service - There are more than 20 engineers for after-sales service and provide 24/7 customer service with 1-year limited and lifetime technical assistance. Please contact us via “ask a question”directly to get the professional assistance.