Set of five reusable FFP2/N95 class filters, made for the Gabriella face mask but suitable for others too. They provide very good protection against bacteria, viruses, dust and smog in the air. The filter should be replaced after all-day use, and then either disinfected with alcohol (minimum 60%, not lager!) or washed in water up to 70 degrees centigrade. OEKO-TEX standard 100 guarantees they're harmless in human ecological terms.