This protective face mask with the standard dimensions of 17.5 x 9.5cm covers the mouth and nose and prevents the spread of viruses and pathogens. It provides your face with 3 layers of protection (1-layer filter material) and is effective in blocking nasal and oral pollutants, as well as in filtering out pollen, catkins, and bacterial particles. Each pack contains 50 face masks, which are for single-use and can be safely thrown away after use. Before wearing the mask, please read the usage instructions to ensure correct wearing. Please note that this product is not suitable for cleaning and should not be used by medical professionals.