1. Replacement Filters Size: The diameter of the round filters is 7.25 inches. The thickness is 5 mm. Compatible with most stainless steel compost pails. If your container size is smaller than this, the filter can be cut into any shape according to your lid size. 2.: 12pcs round compost filters set. We recommend changing the filter every 3-4 months or according to the actual condition. 3. Easy to Use: Just insert the replacement filters into the lid of the compost bin, which is very convenient for you. 4. Perfect Material: The filters are made of activated carbon, which has a strong adsorption capacity. To achieve a better effect, please do not rinse the filters. 5. Compost Bin Filters: Effective filters absorb odors produced by compost bins, keep a clean and pleasant kitchen. Refresh yourself, bring you fresh and clean indoor air. Color: Black Material: Activated Carbon Size: 184mm (7.25 inch) 5mm thick Package Contents: 12 * Round Compost Filters Attention: Remember to change it