Can effectively prevent airborne infection and filter small dust panicles. Non-woven material with air permeability, 99% BFE at 3 micron, breathing resistance < 2.5mm H20 Outer Layer: water-resistant non-woven to prevent fluid from entering the m... - Update: 2006-12-28

Made of PPSB + FILTER + PPSB Breathable, comfortable, barrier to dust 3-ply, with elastic earloop or tie back Color: Blue, green, white Packed: 50pcs/dispenser box, 2000pcs/case BFE: 99% - Update: 2006-12-28