We understand there's a lot of concern about fake 3M masks. We purchase all of our 3M masks from Medline or McKesson (two of the world's largest 3M distributors) who by contract can only buy them direct from 3M. Every mask is 100% authentic with lot numbers that can be tracked back to the manufacturer. Quality and trust are of utmost importance to us here at Pacific Medical Products. You can buy with confidence.