Imprint Method: Unimprinted, Production Time: 1-2 business days - KN95 Face Masks. White, Bulk packaged. Non Medical. Included in FDA Emergency use authorization list. Manufactured by a certified manufacturer. Efficiency 95%. Tested by NPPTL National Personal Protective Technology Laboratory. 2 non-woven outer layer, 2 melt-blown inner layer, 1 non-woven cotton middle layer. KN95 masks are designed to offer more protection than a standard disposable 3-ply mask. Metal nose clip is fixed to the inner of the mask, so it won't fall off. Registration #3016730115.