Premier carbon filter dust face masks are designed to keep the dust out yet allow you to breath comfortably and safely. These black face masks offer 4 layers of protection: - 2 layers of non-woven fabric. - 1 melt-blown cloth layer. - 1 activated carbon filter layer. The activated carbon filter provides extra dust protection while you work. All 4 layers combined provide excellent protection from airborne particulates. Elastic ear loops are comfortable and help to secure the mask properly to your face along with the built in adjustable nose bridge. Every box includes 25 individually wrapped black face masks that can be worn for work play school shopping and other daily life activities (0.5 lb). Not intended for medical use.