Level 3 - 3ply Mask Blue Bx/50 Adjustable Nose Clips The 3 Layer Design Provides Bfe And Pfe > 85% One Size Fits All Ultrasonically Welded Earloops Stay Firmly Attached Tested For Quality Outer And Inner Layers - Spunbond Nonwoven Polypropylene Filter - Meltblown Nonwoven Polypropylene Straps - Polyester Elastic Cord This Mask Contains No Components Made From Natural Rubber Latex Astm F2100 - Level 3 The3layerdesignprovidesbfeandpfe>98%adjustablenoseclipsignificantlyreducesairpenetration ultrasonicallyweldedearloopsstayfirmlyattached testedforqualityintheunitedstates Materialcomposition outerandinnerlayers?spunbondnonwovenpolypropylene filter?meltblownnonwovenpolypropylene straps?polyesterelasticcord noseclip?polyethylenecoatedgalvanizedwire thismaskcontainsnocomponentsmadefromnaturalrubberlatex approximateweightofproduct:3.0grams/0.10oz