... 250g Package: 50pcs/ box, 50boxes/ctn. Specifications Disposable dust maskStanderd SizeColour: white, blueMaterial: SPP 120g-250g and Terylene ... electrostatic effect which effectively filtering the solid powder, dust and preventing the oily liquid gas. Suitable for ... , agriculture and animal husbandry, cement, textile, cutting dust, pollutes form heavy metal, electron etc. Disposable Dust face masks