Feature: 1. TINY APERTURE: Tiny aperture can filter fine dust, effectively block dust and keep the host shell clean. Keep the indoor space in good and clean condition. 2. HIGH VENTILATION RATE: The ventilation rate of the filter is as high as 65%, which makes heat dissipation far better than ordinary filters. Can be used for home computer case fans, dust filters, speaker grills and other electrical or electronic products to prevent dust. 3. PREDRILLED SCREW HOLES: Precise cutting process and one piece nonmarking magnetic frame, reserved screw holes are convenient for installation of nonferrous metal cases; for micro curved surfaces, it can also be tightly adhered, with good dustproof effect. 4. STURDY NYLON MESH: The toughness of the nylon material creates a strong resistance to pressure, better than other plastic mesh. Magnetic fan filter supports 80mm fan ventilation holes, convenient and thoughtful 5. MAGNETIC FAN FILTER: The magnetic fan filter can be easily installed on the ventilation holes of the chassis or power supply and can effectively isolate dust and dirt intrusion. Users can install it quickly Specification: Item Type: PC Computer Case Fan Dust Filter Material: Nylon, Soft Magnet Color: Black Product Size: Approx. 80x80mm / 3.1x3.1in Scope of Application: for PC Chassis Power Supply, Fan Vents. Package List: 5 x PC Computer Case Fan Dust Filter Note: All data are measured manually, and there are certain errors in the measurement results.