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: adults：12X8cm Package Included: 5/10/20/30/50 pcs Mask filter cartridge Dear customer! Welcome to my store and hope you have a pleasant shopping experience. Before placing an order, please check your address and phone number so that logistics can effectively and accurately deliver the product to you. Thank you!