General description Pack of 30 unisex adult double valve filters with adaptable activated carbon to effectively filter fine particles from the ambient air. These filters are soft, breathable, hypoallergenic, and comfortable, making them suitable for various environments. Technical specifications Dimensions: 14 x 10 cm Material: Non-woven fabric, hypoallergenic melt-blown cotton, activated carbon fabric, and submicron fiber Filtration: 5 layers of multiple protection Compatibility and accessories Compatible with most standard size reusable and washable masks with filter pockets Does not include the mask Usage Easy to use: Place a filter in the back pocket of the mask for added protection Replace the filter at least once a day The filter pad is disposable and cannot be reused