* Meeting the international quality criteria (Europe): EN149: 2001, EN 13274-7:2003 ,EN 143:2000 * Made with multi-layered nonpoisonous, non-allergic, non-stimulating materials. * Adjust the bandage strip and the built-in bandage foam cushion to adapt to various face-shapes with comfortable sealing. * The high-efficient and strong electrostatic filtering materials effectively filter the solid particle dust, and prevent the oil liquid gas. * Use for construction, mining, textile, grinding medicine, disintegration projects, cement, agriculture and animal husbandry, cutting dust, pollutes from heavy metal. According to your requirement.