1,Filtration efficiency N95 2,Dustproof efficiency:99% 3,OEM are welcome 4,clean and health Detailed Product Description1,Filtration efficiency N95 2,Dustproof efficiency:99% 3,OEM are welcome 4,clean and healthName: activated carbon dust maskMaterial: 70g filter Non-woven+50g Active Carbon+55g filter+180g needle punched.Packing: 20pc/box, 400pcs/ctn Inner box size:13*14*21CMCarton size: 67.5 * ...