Dust filter set: dust filter size is 120 x 120 x 0.45 mm; Mesh hole diameter is 1 mm; Fits for standard 120 mm or slightly smaller size fans; PVC material, lightweight Good dust reduction properties: computer dustproof mesh has fine holes, can provide efficient dust reduction properties, protect you computer from overheating Keep computer clean: computer fan filter can help to keep your PC and PC components clean, minimize the noise from the fan and extend the life-span of your fan Wide application: suitable for home computer chassis fan dust, speaker speaker grilles and a variety of electrical and electronic products speakers dust protection Package includes: 10 set of dust filters, each set includes 1 piece computer fan filter and 4 screws, 10 dust filters and 40 screws in total, convenient for you to replace