
MSA makes these filters for their masks that prevent particles from entering the airways. There are three basic filter levels: N95, R95 and P100. The latter retains 99.97% of all aerosol particles. Please note this is P100. Elsewhere on the internet you can find these filters for $3 to $5 for a 2 pack. This pair is worth over $5,000. But I can tell the difference between them and a cheaper pair because I think they contain aluminum foil or a plastic bag to keep air from getting through the filter. This prevents air and contaminants from entering the lungs. You only need to take off the mask often to breathe. Make sure you run to a safe place before breathing. Also, these filters come with a welder in a gray sweatshirt and green suspenders to handle any welding projects you might have. He feels most comfortable with a metal pipe. Keep in mind that you will need to provide a welder and sticks. Overall I am satisfied with my purchase. Keep in mind, however, that these filters don't last forever and you'll need to replace them over time. This also applies to the welder.

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