The ALCHEMY Disposable Face Mask D2 protects users against some infectious diseases. Effectively filters dust particles and bacteria larger than 2.5um, preventing most virus infection sources and protecting the respiratory system. This face mask passes 3 certifications for use: FDA Certificate, Conformity Certificate and Bacterial Filtration Certificate. It is suitable for outdoor activity, travel, public activities, work spaces, catering services, food processing and schools, etc.