About this item [Compatibility] ONLY Compatible with Litter-Robot 3 Self-Cleaning Cat Litter Box. If any doubt, please check product dimensions. [Compatible Carbon Filter] Length is about 10 inch. Width is about 3.6 inch. Thickness is about 0.6 inch. The Replacement Seal Strip Set: 2 long strips and 2 short strips: Long (11.5″ x 0.38″ x 0.38″), Short (4.5″ x 0.38″ x 0.38″) [Keep the Litter-Robot Fresh] Our premium carbon filter absorbs odors in the waste drawer. Our Replacement Seal Strip Trap unpleasant odors as well. [Frequency Of Replacement] It is advised to replace the Carbon Filter every month. We recommend replacing the seal strips when you notice they are worn flat or peeling up. [Friendly Customer Service] Please feel free to contact us if you have any questions about our products, we’d like to help you!