This NIOSH (National Institute for Occupational Safety and Health) approved dust mask is more expensive than the standard NIOSH approved dust mask, because it comes with a exhalation valve. They come packaged 10 masks per box. The N95 particulate filter has a 95% efficiency level, and is effective against particulate aerosols that free of oil. Time use restrictions may apply.

If this not the particular mask you were looking for please take a look at our complete line of particulate & surgical face masks available.