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Replacement Filters for Gas and Pollutant Reducing Nasal FiltersFor use with WoodyKnows Gas and Pollutant Reducing nasal filters. Can also be used with WoodyKnows Ultra Breathable Nasal Filters(New Model) frames and WoodyKnows Super Defense Nasal Filters(New Model) frames. No black retainer is needed. Replacement-filter packs do not contain filter frames, so these can NOT be used on their own.Packaging Contents: 12 pairs of replacement filters for WoodyKnows Gas and Pollutant Reducing nasal filters Pure Air Wherever You Go!