Dust mask 1.made by non woven polypropylene spunbond 2.convient to use and bring 4. keep out from the dust 1.. this disposable dust mask we usually produce 12 kinds: 100gsm,120gsm,140gsm,160gsm,180gsm,200gsm,220gsm,240gsm,260gsm, 280gsm, 300gsm,320gsm,you can choose as you like, Also we do do as your requirement2. material: it is 100% non-woven ,it is soft for wearing.3. colour: white4. approved ...