RUIERXIN from 2020 - PRC
 
4 layers:
First - SS spunbond 60 g/m2
Second - antibacterial material 99-meltblown 25 g/m2
Third - antibacterial material 99-meltblown 25 mg/m2
Fourth - SS spunbond 60 g/m2  with a cooling antibacterial mint smell
 
Each mask has its own individual transparent envelope inside the main package.