... available 3. OEM 4. Color available Rubber Strap Foldable Dust Mask with valveDescription1. Approved to international standard: ISO9001 EN149:2001 ... FFP2 and NIOSH N952. Special 4-ply compound design with active-carbon to resist Avian Flu Virus, SARS Virus, ... processing, environmental sterilizing, and worse workshops.5. Style (with valve/with active carbon) Packing:20pcs/box, 24box/carton.Carton Volume: ...