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Description: Welcome to our store The filter element of this mask has 5 layers of protection, bringing you a safe breathing experience Special 5-layer activated carbon filter can effectively filter PM2.5 haze, dust and other fine particles Prevent second-hand smoke and automobile exhaust. The filter cannot be cleaned. It is recommended to replace it once a week Specifications: Anti haze and dustproof square arc active carbon filter active carbon PM2.5 mask filter weight: 15g size:12.5*8*1 Package Included: 10*Mask filter cartridge