Our adult face mask contains 3 premium layers; pp non-woven outer filter layer, melt-blown polypropylene filtration layer, and a soft absorbent pp non-woven inner filter layer. Soft ear loops with adjustable nose clip. Our masks are sold to all over the world in most common workplace environments. They are used in everywhere. Size17.5*9.5cm Executive standardGB32610-2016 ModelCY-02 Validity2 years Quantity 50 pieces / boxChina Disposable Face Mask factory website:http://www.chuandatech.com/disposable-face-mask/