High-performance disposable non-woven mask, BFE 95%・PFE 90%, 50 masks per box - BFE: 95% - PFE: 90% - Brand new, unopened What is PFE? PFE (Particle Filtration Efficiency) refers to the "particle filtration efficiency," indicating the percentage of approximately 0.1μm (micrometer) sized particles that are filtered (captured). This includes influenza viruses, individual viruses (droplet nuclei), and tuberculosis bacteria. What is BFE? BFE (Bacterial Filtration Efficiency) refers to the "bacterial filtration efficiency," indicating the percentage of particles containing approximately 3μm bacteria that are filtered (captured). This includes pollen and droplets containing moisture from coughs and sneezes. Thank you for viewing. Please refrain from purchasing if you are seeking perfection or are overly sensitive. No pets, no smokers. Packaging will be shipped in a cardboard box. No price reduction. Immediate purchase is welcome after understanding the product. Thank you.