120mm x 2 Magnetic Frame Dust Filter, Computer Dust Filter and PC Computer Case Fan Dust Filter Screen Dustproof Case Cover with Magnet, Ultra Fine PVC Mesh Set of 2

More of a screen than a filter. Some cases don't come with any kind of filter and these work in those cases. holes are too big and too few. A filter should be a fine mesh

Does the job well. Just be aware the magnets aren't the strongest so if you bump into the filter at all, it will move.

All around good product for the price.

Perfect worked for exactly what we needed them for

This is pretty helpful for keeping dust away.

Good product, collects majority of dust and is easy to clean

Great product great price.