4ply-5ply design to successfully prevent dust and bacteria Material :pp nonwoven, active carbon(optional), soft cotton, melt blown filter, valve(optional) With inhalation valve to avoid bacteria and dust Packing 20pcs/box,400pcs/carton, as well as can be per customers require Certificates ISO/CE etc relative certificates & test reports. we also have many other styles ,like no valve style, active carbon styles, adjustable ear loop styles and so on
