3-Ply Disposable Surgical Face Mask Face Masks Features Color and packaging: Blue, packaged 50 masks per box First ply (outside) is non-woven Middle ply is filter-paper (melt blown fabric) Third ply (on-face) is non-woven fabric CE approved and FDA registered Safe for up to 8 hours of use. Comfortable design is made for easy breathing while providing high-barrier protection. Over 90% BFE - the Bacterial Filtration Efficiency (BFE) protects against bacterial penetration. Masks offer a flexible nose piece that helps form a closure for better protection against exposure. Pleated ear-loop face masks are designed with comfortable elastic ear loops for easy wear.