5 sealed packs of 4 replacement N99 Filters for AusAir Flex masks Size Large Mixed subtle natural fragrance pack - each box contains 1 x blank, 1 x eucalyptus, 1 x tea tree and 1 x lavender Each filter provides up to 28 days of effective filtration. Certified to filter >99% of viruses, bacteria, PM0.1 and more.
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