Ultra No-Fog Mask - Blue, Single Box, 40/Bx. BFE > 98%, PFE = 99.7% at 0.1 micron, Fluid Resistant, Latex-Free, Extra Long Aluminum Nose Piece, Flame Spread Class 1, Delta P (breathablility) < 5.0, ASTM High Barrier 5. Box of 40. Single Box. Box of 40 masks