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48 pack of replacement inserts for the Honewyell Dual Layer Face Cover. This filter insert has been shown by a third-party testing facility to block up to 97% of 3-micron-sized non-viable particles and 0.1-micron-sized aerosolized particles. Filters are disposable, single-use filters that you throw away after a day's use. They are designed so you can start with a fresh filter every day.