PM2.5 Mouth Nose Disconnect-type Reusable Washable Silicone MaskThis silicone face mask with filter replacement makes it reusable, one piece filter can be used for 2 4days, and the silicone mask can be infected by washing, boiling, alcohol. Special circumstances, such as hospitals, bad environment, unhealthy places or long term wear 2 4 days to replace one filter. Features: This silicone face mask with filter replacement makes it reusable, one piece filter can be used for 2 4 days, and the silicone mask can be