XtraClean™ face masks are made from a 3-layer construction of non-woven polypropylene and feature a flexible (sealed) aluminum nose bridge. These quality facemasks are 7" wide, providing a 99% bacterial filtration efficiency and 99% particulate filtration efficiency. These XtraClean™ K-Style face masks feature unique heat-sealed “K-Designed” fit on both sides, creating a more secure fit than traditional face masks. Packed 50 per Package, 10 Packages/Case, Total: 500/Case