Compost Bin Filters - 2 Pack by The Relaxed Gardener - Set of 2 Black 4 Inch Round Odor Abscorbing Replacements for Kitchen Composting Buckets 4 inch diameter 1/8 inch thick charcoal material to keep odors in the pail and not in your home. No odors means not attracting fruit flies. Fits The Relaxed Gardener Art Deco Compost Bin (0.8 Gallon) - Same quality filters that are included with the pail, not cheap replacements Made to last for 6 months with proper care Easy to clean - hand wash with warm soapy water and allow to air dry. Easy to remove and install. Fits lids which take 4" round filters