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. This N95 respirator (Model 9500-N95) made by Makrite Industries is approved by the National Institute for Occupational Safety and Health (NIOSH) and U.S. Food and Drug Administration (FDA). TC number: 84A-5411, TC-84A-5411.