product description: Activated carbon masks can effectively prevent smog, industrial exhaust, cigarette smoke, and other harmful gases in vehicle exhaust to protect human health. Suitable for outdoor, shopping, cycling, skiing, jogging, buses, hospitals, subways, etc. Material: Polyester Package includes: 1 x mask, 2 x activated carbon filter, M-shaped nose clip Material properties: 1. Comfortable and soft 2. Breathable, washable and reusable 3. The length of the wide elastic ear strap can be adjusted at will 4. Each mask with 2 activated carbon filters should be changed once or twice a week how to use 1. Open the mask and insert an activated carbon filter 2. Cover your nose and mouth with a mask 3. Adjust the buckle on both sides of the mask to the best position 4. Adjust the nose clip to fit your nose 206. It is recommended to wash by hand, do not bleach