Hiki ke hoʻohana ʻia kēia mau huna ʻoki kino he 4 mau papa o Polypropylene Ultrasonically Welded Together: 3 Spunbond Polypropylene Layers ma waho, 1 Meltblown Polypropylene Filter Layer i loko. A ʻo nā wili pepeiao pepeiao wili i mua o ka pepeiao - a i ʻole nākiʻi i nā pihi pepeiao e hoʻopōkole. Kēia mau ʻoki kino pale maka lapaʻau he Surgical Masks Intended for Liquid Barrier Protection and Provide: Bacterial Filtration Efficiency (BFE): 99 +%.