Compliant with the new ASTM F2100 standard (US standard for medical masks).
The built-in high-performance filter achieves high filtration accuracy of BFE≧98% PFE≧98%.
The nose piece is made of aluminum and fits snugly around the nose. Material: Polyethylene/polypropylene blend non-woven fabric, aluminum plate
Size: Height 89mm, Width 178mm
Quantity: 50 sheets
