JTY A-11 FFP1 NR Dust Mask, without valve, Meeting the international quality criteria (Europe):EN149:2001 ... non-allergic, non-stimulating materials.3) Adjust the bandage strip and the built-in bandage foam cushion to adapt to variousface ... , mining, textile, grinding medicine, disintegration projects,agriculture and animal husbandry, cutting dust, pollutes from heavy metal.Shelf life: 3 years. ...