1.Replacement Filters Size: Round filters diameter is 7.25 inches.The thickness is 5mm.Compatible with most stainless steel compost pails.If your container size is smaller than it,the filter can be cut into any shape according to your lid size. 2.Durable:Set of 12pcs Round Carbon Compost Filters.Recommend changing the filter every 3 to 4 months or based on the actual condition. 3.Easy to Use:Just need to shove the replacement filters into the compost bin lid,very convenient to use it. 4.Great Material:The filters are made of activated-charcoal,which provide strong adsorption capacity.In order to win a better effect, please do not rinse the filters. 5.Compost Bin Filters:Effective filters absorb odors produced by composting bins, keep a clean and nice kitchen.Refresh yourself,brings you and clean indoor air. colour:black Material:Activated carbon size:184mm (7.25 inches) 5mm thick Package Contents: 12*Round Compost Bin Filters Attention: Remember to Change it Regularly, Please Do not Rinse. Keep it from Fire. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.