Use edit one wearing a mask to wash hands before two with both hands holding a rope, the darker side of the outer (blue), light-colored, (matte white) 3 masks have one side of the wire (a small hard) on the nose, according to his nose is pinched wire completely down, and then put the mask to cover body mask completely cover your mouth and nose 4 general 8 hours to replace a disposable masks, can not be reused.