The Sol-Millennium Medical MSK003X is an ASTM Level 1 Medical Mask that comes in a case of 2000. These masks are designed to provide a high level of breathability while ensuring optimal protection. They are constructed with a 3-ply SMS filter material that effectively filters out harmful particles. The mask also features a nose clip and earloops for a secure and comfortable fit. Ideal for use in medical settings, these masks are designed to meet ASTM Level 1 standards for protection.