Set of Activated Carbon PM2.5 Filters, Active Carbon Filters for Mesh or Neoprene Mask (30)

Description

Duration of Filters and Valves: Duration time for filters depends on the pollution level and the frequency of usage. We recommend replacing the filter once a week if the mask is used extensively.  The valves should be replaced when they get damaged.  Package Include: 30pcs Activated Carbon and 6pcs Exhaust Valves Replacement