These mask are intended to be used for prrotection against  particulate, PM2.5 smog, powder, dust, Non-oil particles.
Quality Standard:  GB2626 2006 KN95
This product is on the FDA approved list to be imported to USA.
POWECOM company has CE certification.
 
CDC Approval Link: https://www.cdc.gov/niosh/npptl/respirators/testing/NonNIOSHresults.html
Product Info Link: http://www.powecom.com/eng_index.html
 
Note: 400 per carton