10-pack KN95 face mask without valve.
Standard: GB2626-2006 KN95.
KN95 masks (non-powered air-purifying particulate respirator) come from China and comply with the GB2626-2006 standard of the Standardization Administration of the People’s Republic of China (SAC).
KN95 masks are comparable to FFP2 masks in terms of filter performance.
3M published the differences between FFP2, KN95 and N95 in a study. You can download the study here (LINK)