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Features: Resistant to organic vapors, particles, dust, etc. High-efficiency electrostatic pre-filter cotton, low permeability, smooth breathing, better protection, effective and convenient, to provide you with a better living environment. Suitable for dust masks, respirators, fine air filters, wholesale anti-odor smoke, custom cotton dust masks, gas masks, safety masks, house decoration, mining, laboratory experiments and many other occasions. product name: PM2.5 smoke-proof N95 particle industrial dust-proof and comfortable mask product description: Material: non-woven fabric / static filter cotton Certification: China KN95 Level function: anti-fog, dust-proof, anti-virus, etc.