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Our replaceable 5-layer face mask filter is available in one kid's size. Our activated carbon filters are brand new and high-quality. They're compatible with the majority of mouth covers available in the market. Specification: Size: 7×10 cm Material: Non-woven cloth Color: White Package Including: 100 pcs Designed For: Kids How To Use: Step1:After washing your hands,take out the product. Step2:Place the PM2.5 carbon filter pad in the mouth cover to prevent slipping. Step3:Install the PM2.5 carbon filter,fit your face and wear it correctly. Tips: 1.Filter insert can not be cleaned and should be replaced every day. 2.When film or sticky sediment emerges, please replace the filter. 3.Compatible with reusable and washable anti-pollution, anti-dust, anti-haze PM2.5 masks. We guarantee the quality of the products. If you have any question, you can contact us through Amazon, and we will solve it for you immediately.