The mask is 4 layers protection, the upper material is non-woven,the middle is high-efficiency filter cotton,high-efficiency filter melt-blown fabric,the inner is white non-woven. This KN95 mask is approved for environments containing certain non-oil based particles and provides at least 95 percent filter efficiency. we have our own lab and test machines in our factory, all our masks will be checked and passed qualified then we can deliver it . We have CE / FDA/ and Chinese Standard test report for our masks, no problems for export .