Pit Filter - Made in Japan, Certified by Kaken PFE0.1 Test, High-Performance Filter Sheet for Masks Certified to block 99% of droplets, viruses, PM2.5, pollen, and dust by the Japan Kaken PFE0.1 test. Washable and reusable. This is not a mask itself. The item has been opened for inspection and photography, but it is unused. Images are for illustrative purposes only. Please be sure to check the actual product photos and the size in the description before purchasing.