Removes 97% of pollen / dust / dander / mold?? 90% of germs / PM2.5 pollution (tested by Nelson Lab)</br>Cutting-edge electrostatic filter attracts airborne particles for high filter efficiency with a thinner fiber layer</br>Can also be used with WoodyKnows Ultra Breathable Nasal Filters(New Model) frames</br>Disposable?? replace every two days</br>24 pairs of replacement filters</br></br>Product Description</br></br><p><b>Replacement Filters for Super Defense Nasal Filters</b></p><p>For use with WoodyKnows Super Defense nasal filters and Ultra Breathable nasal filters. Replacement-filter packs do not contain filter frames?? so these can NOT be used on their own. <p><b>Packaging Contents:</b> 24 pairs of replacement filters for WoodyKnows Super Defense nasal filters</p> <p><b>Pure Air Wherever You Go!</b></p></br><br/>http://www.amazon.com/gp/product/B00DKX0ZPY