... ,180gsm,200gsm,220gsm,240gsm,260gsm, 280gsm, 300gsm,320gsm,you can choose as you like, Also we do do as your requirement2 ... . approved particulate respirator,comfortable nose foam.5. there is a aluminum strips on the nose,in order to make mask adapt to different ... feature. 6. it is use ultrasonic wave to make the elastic to contect the mask strong,so you will find ...