3M 923345-02 is a pack of 25 disposable Nuisance Dust Masks that are designed to help protect against non-toxic airborne particles, such as sawdust and some pollen. These masks are lightweight and easy to breathe through, while they are made with a comfortable, latex-free design, adjustable metal nose bridge, and adjustable elastic head straps. The masks also come with an exhalation valve to help reduce heat buildup and sulphur dioxide buildup inside the mask. These masks are designed for use in general home, workshop, and construction settings.