... Color available Rubber Strap Foldable Dust Mask with valveDescription1. Approved to international standard: ISO9001 EN149:2001 CE 0194 FFP1 & FFP2 ... N952. Special 4-ply compound design with active-carbon to resist Avian Flu Virus, SARS Virus, saliva also good ... a custom seal for different facial sizes.4. Suited to chemical, chemistry solution, printing ink, dyeing, auto building, ships building, ...