I have an assortment of new and unused respirators. They include: 2x 3M half-face, silicone, medium respirators - part 7502 2x 3M half-face, silicone, large respirators - part 7503 20x - 3M particulate filters P95 - part 2071 (expiration - 01/2025) 12x - 3M particulate filters P95 - part 2071 (expiration - 10/2024) 4x - 3M advanced particulate filters P100 - part 2097 (expiration 12/2022) Originally purchased from BC Fasteners and Tools, and One Source Industrial Suplies.