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Blue Anatomical Face Mask With Elastic Ear Loops (Pack of 20) mil-spec PROFERRED FLEX RATCHETING COMBINATION WRENCHThese masks contain two layers of 100% polypropylene, spunbond SS (2 ply), non woven fabric providing a superior penetration barrier. Features Outer shell provides high fluid resistance and inner layer supplies high density filtering Highly durable Hygienic and safe Lightweight, flexible and breathable Non toxic, non irritating One size fits most Technical Information Bacterial filtration efficiency greater than 99% for media larger than 3 microns