Review on ThreeBulls 12 Pcs 120mm PVC Black PC Cooler Fan Dust Filter Dustproof Case Cover Computer Mesh - Keep Your Computer Dust-Free and Efficient by Bobby Montoya

Bought a set of these filters as well as one of the SilverStone 80mm FF81B mesh fan filters. They do their job, but they're secondary in comparison. They only consist of a somewhat thin filter fabric, while the Silverstone is enclosed in a plastic housing. OTOH, SilverStone is one and ThreeBulls are 12 per pack. The ThreeBulls package came with a set of corner screws to hold a filter, but I threw them away, they were too short and not thick enough to attach securely to my case, I had to use the existing fan screws instead. A small criticism of both products: they don't completely cover the entire round hole for me, there is a gap of about 1 mm on all four sides.