Features: The PC dust filter can help to keep your PC and PC components clean, extend the life span of your fan. The computer dust proof mesh has fine holes, which can provide efficient dust reduction properties, and avoid you computer from overheating. Specifications: Dust filter: Material: PVC nylon Color: black Size: about 4.7 x 4.7 inch/ 120 x 120 mm Mesh hole diameter: about 0.02 inch/ 0.5 mm Package includes: 30 x Computer fan filters 120 x Screws Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. Small items are included, please them away from little kids.