... Flu, with a filter encased in 3 layers of non-woven fabrics3.BFE95%, BFE99% filter paper and Normal filter ... , with a filter encased in 3 layers of non-woven fabrics. It has high filtration efficiency and is ... , with a filter encased in 3 layers of non-woven fabrics2, With elastic ear loops of straps and ... , 1000PCS/CTN, 2000PCS/CTN, Package Includes: 50pcs Medical Ear-loop Respirator Face Surgical Mask