feature: 1: Black surface looks more beautiful 2: The widened ear strap line will not hurt your ears 3: 5 layers of filter material, better protection 4: Contains 2 layers of melt blown cloth filter, which can filter 99% of bacteria and a small amount of pollutants 5: Hidden nose bridge, beautiful and not easy to fall off 6: Use in crowded places, such as schools, subway stations and urban areas 7: You will get 30/50/100PCS black KN95 mask 8: The KN95 mask cannot be washed with water and should be discarded after use 9: KN95 can be used repeatedly 3 to 4 times. If you find obvious stains or increased breathing resistance, you need to replace KN95 in time 10: If you have any questions, please contact us in time, we will deal with your questions within 24 hours, I wish you a happy shopping! Warning: Suitable for use over 5 years old, avoid suffocation, do not use it while sleeping!