KN95 civil grade mask. The mask is composed of four layers of materials, namely Nonwoven Fabric, Cotton Filter, Meltblown Fabric, Nonwoven Fabric. Execution Standard is GB2626-2006 / EN 149: 2001 + A1: 2009. Expiration Date is 3 Years. This product holds a CE certificate issued by a medical device certification body designated by the European Union, and the manufacturer has a certification issued by the US FDA. This mask can be exported to Europe and the United States, and relevant certifications will be attached.