These masks are intended to be used for protection against solids, such as those from minerals, coal, iron, ore, flour and certain other substances. They are extremely durable with a soft and comfortable inner surface, also have an adjustable nose piece and secured head straps to provide proper fit. These masks have a 510(K) number for the medical market and can be used TB situations as recommended by OSHA. In our opinion, Makrite has one of the best N95 cup style masks out in the market place. NIOSH, FDA and CE Certified. 100% financing available with the product. Ask for more details.