I am searching the surgical masks. Here are the requirement. 1. Must meet one of the filtration standard : BFE PFE VFE ASTM 2. Better to have indivstic bag packing of each piece or per 10 piece or per 50 piece 3. 50 piece per box 4. Earloop 5. 3 layers is preferable. If you have 4-layer mask , it is better