2. Product name: disposable protective masks (a box of 50 pieces). 3, the main raw materials: non-woven cloth, melt-blown cloth 90+. 4. If the package is in good condition, the service life is two years. 5, suitable for daily life under the cold virus air pollution filter particle protection. 6, professional quality inspection report of all indicators qualified, safe use. 7. Adjustable nose bridge strip, high elastic ear strap, three-layer folding design, ultrasonic spot welding.