168.8 billion trustworthy masks are reliable. According to relevant information inquiries, Yixin Mask Taobao is formal and mainly produces and operates Class I, II, and III medical device products, covering protection series, anesthesia series, etc. A mask is a sanitary product that is worn on the mouth and nose to filter the air entering the mouth and nose to prevent harmful gases, odors, and droplets from entering the wearer's mouth and nose. It is made of gauze or paper.