... free 2.Latex-free synthetic rubber head strap. carbon mask,respirator,non-woven carbon face mask Features1. Conforms to international standards: EN149 ... , food processing, cement textile, disintegration, carving, heavy metal pollution, gardening, glass, workshops, etc. Package1. Box: 20pcs/box,20 box/carton, 400pcs ... shape of mask according to customer's demand in details. carbon mask