Features: brand new and high quality 13-blade design offers a higher airflow and quiet cooling solution for the best performance. PWM capabilities built-in to precisely control the speed to achieve optimized fan curve. Rigid frame design and included rubber dampeners helps to prevent vibration. Low-noise operation without sacrificing performance. The hydraulic bearing design，it has a large oil storage space and an oil seal cover, which can reduce lubricating oil over flow, while reducing friction and noise. Specifications: Material: ABS Colour: Black Product size: approx. 14X14X1.5cm/5.51x5.51x0.59in Rated speed: 300~1100RPM ± 10% Rated voltage: 12V for DC Current: 0.20 A ± 10% Maximum air volume: 54.5CFM Noise: 26db (a)± 10% Connector: 4pin (pwm) Bearing type: hydraulic bearing Package Includes: 1 X CPU cooler note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!