Three-ply 100% cotton jersey Fabric touching skin: 100% cotton Mask contains silver and copper Three evenly-spaced pleats on each side May be used when FDA-cleared masks are unavailable Machine washable 5 masks per pack 500 units per case (100 inner poly bags with 5 units each = 500) Non-returnable Not recommended for use in a surgical setting or where significant exposure to liquid, bodily or other hazardous fluids may be expected and where the infection risk level through inhalation exposure is high. The product has not been FDA cleared or approved.