... 99. 8% 3.Adjustable nosepiece 4.good quality and reasonable priceDust mask ingredients; using non-woven fabrics, ... smooth fabric to reduce fiber loss, disposable, maintenance-free, convenient and practical, more safety and health.Scope; medical, anti-flu, avian influenza ... , swine flu prevention, anti-H1N1, food hygiene, electronics, dust-free clean ...