Offers relief from non-toxic dusts, pollen, animal dander and other nuisance level dusts at exposures below the OSHA Permissible Exposure Limit (PEL). Lightweight, easy to breathe through, fits easily and comfortably, and economical. Weighs less than 1/3 ounce and will not collapse when it becomes wet. Not NIOSH approved - designed for non-toxic dusts only. Box of 50 masks. US Safety brand.