Product Info:China Hospital One time use KN95 Disposable Medical Mask with CE and FDA License that helps provide reliable respiratory protection of at least 95 percent filtration efficiency against certain non-oil based particles. This respirator is designed for use for particles such as those from grinding, sanding, sweeping, sawing, bagging, or other dusty operations.All of them have China goverment's medical liense. Each box is 100 pieces.