The medical mask is divided into Building Hardware three layers, with a filter layer in the middle, which can filter bacteria or viruses and prevent pathogenic microorganisms from invading the human body and causing respiratory diseases. Medical surgical masks are divided into medical surgical masks and medical N95 type masks. Medical surgical masks can filter about 30% of bacteria or viruses in the air to prPrinting MateriaSealing & Gaskets ls event them from invading the human body. Medical surgical masks are suitable for the general public. For people working in the epidemic prevention and other departments, it is recommended to wear mediIndustrial Customized Service cal N95 masks, which can filter more than 95% of bacteria or viruses in the air to avoid invading the respiratory system of the human body, Tag Gun