98% Bacterial Filtration Efficency. Filters meet the surgical mask standard. Replacement filters for BUFF® Filter Mask. Enjoy comfort in style. Filter Pack BUFF® - 30 units. Pack of replacement filters designed for BUFF® Filter Mask. Highly breathable to ensure your comfort on daily activities. Triple-layer construction, 98% bacterial filtration efficiency and water repellent properties. Non-reusable filters, 24 hours maximum reccommended use. Totally binder-free, latex-free, glue-free, fiberglass-free. . Features Sold in packs of 30 units. Filters meet surgical mask standard EN14683:2019, Bacterial Filtration Efficiency (BFE) and Differential Pressure (breathability) Type I & II. Packed in a clean room. Filters made in Germany by Ahlstrom-Munksjö.