Disposable Face Mask(With/Without Valve) Low breathing resistance with high filtration efficiency. Adopted the medical grade non-toxic polypropylene material, Adjustable contoured aluminum nosepiece and a soft inner foam nose cushion help to ensure proper fit. Easy-Breathing exhalation valve with inner Silicon-piece can facilitate the air exchange and increase worker comfort. Special 3-Poly design respirator produced from high filterable and electrostatic material for resisting normal toxic and tiny micro particle.