... 9.5cm -Style:Ear-loop or Tie-on -Non-irritating to skin -Anti-Flu 1.Used in Hospital ... Flu, with a filter encased in 3 layers of non-woven fabrics3.BFE95%, BFE99% filter paper and Normal filter paper4 ... Mask, with a filter encased in 3 layers of non-woven fabrics. It has high filtration efficiency and is ... Flu, with a filter encased in 3 layers of non-woven fabrics2, With elastic ear loops of straps and a ...