Good anti-virus effect. The reason why Yixin's masks are expensive is that they have good anti-viral effects and can effectively resist more than 98% of viruses. Yixin Medical Device Co., Ltd. was established in 2014, covering an area of ??more than 300 acres and with a registered capital of 56.66 million yuan. It mainly produces and operates Class I, II, and III medical device products, covering protection series, anesthesia series and nursing series, registered products ***62 types, more than 800 specifications, currently has 3 invention patents, 69 utility model patents, and 6 scientific and technological achievement transformations. It is a medical device company integrating R&D, production, and sales.