SAFETY WORKS Toxic Dust RespiratorFlexible facepiece material provides an excellent face to respirator seal which improves fit and comfort. Long life cartridges are approved to the NIOSH P100 Class, so they are at least 99. 97% efficient against oil and non oil based contaminants, and are oil proof so they have no time use limitation. Included P100 low profile cartridges feature rear entry air flow that helps keep debris out of filter and makes fit checking easier. The included