product features: Product size and specifications: 18x10CM Main ingredients: melt-blown cloth and non-woven cloth Storage conditions: Store at normal temperature and ventilation Features: Divided into 3 layers: outer layer middle layer inner layer Outer layer: Non-woven protective layer: Moderate thickness and flexible Middle layer: meltblown electrostatic microfiltration layer Inner layer: non-woven protective layer Made of environmentally friendly materials, moisture-proof, non-toxic, soft and comfortable. Low respiratory resistance Comfortable nose bridge High filtration capacity, filtration level is 90% -95% Perfect fit on the face and bridge of the nose Special three-layer non-woven design can resist dust, virus, pollution, car exhaust, pollen, etc. The shipment contains: 10pcs mask 50pcs mask 100pcs mask