120MM: 5 pack of 120mm black computer dust filter for pc with 20pcs of M5×20 fan mounting screws EASY TO CLEAN: Made of PVC plastic material, flexible and durable, corrosion resistance. COME WITHX8MM FLAT HEAD SCREW FASTENERS: 4 mounting holes which can be easily installed onto any cooling fan with a 120 millimeter square frame. HELPS TO KEEP YOUR PC AND PC COMPONENTS CLEAN: minimize the noise from the fan and extend the life-span of your fan. Effectively reduce dust and damage to the computer USED FOR ALL KINDS OF 120MM COMPUTER CASE FANS,: speaker speaker grilles and a variety of electrical and electronic products speakers dust protection