3M masks are now in greater demand because 3M is an internationally renowned brand, specializing in the production of medical supplies, protective supplies. 3M masks are of very good quality, so when choosing masks may be inclined to go for 3M masks. From the bag on the 3M mask packaging is more delicate, the above printing are very clear, there are fake bags fuzzy, or even hand can be gently wiped off, the bag is more shoddy. In addition, after opening the lid need to check the mask there is no abnormal smell, normal 3M masks do not have any odor, counterfeit masks will have a bad smell. There is also workmanship, the genuine choice of ingredients and workmanship around the very delicate, workmanship around the absence of any prickly hand feeling, and printed on the top of the 3M logo font is clear, will not be rubbed off. Content source: Have come doctor