Features: brand new and high quality Dual practical: Our fan dust filter is a three-in-one combination - two fan cases and a filter. You can install the for case to your fan which no for case to meet reducing the noise and avoid cut off something, the filter will remove the dust, keep your equipment clean and prolong its service life, valuable combination, suitable for fans. Higher quality filter: Nylon filter synthetic resin absorption almost all dust, reduce dust damage and extend fan life-span, this material make it more durable, stable, prevent deformation, you can clean it easily and reuse it. Sturdy fan case: The Fan for Case made with ABS resin material, can heatproof and can be recleaned repeatedly. Easy installation: Just separate the fan for case which has four screw holes, then screw the for case onto your fan with screwdriver which including, finally put the filter and the other for case on it. Norisks purchasing: for Lifetime friendly customer service. If you are unhappy with our product, please contact us immediately. Specifications: Color: Black Material: PVC nylon Size: approx. 9cm/3.54in, 11cm/4.33in, 12cm/4.72in, 15cm/5.91in, 17cm/6.69in, 18cm/7.09in, 20cm/7.87in(optional) Note: No retail package. Please allow 1-3mm 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 Package includes: 1 x Dust Cover