Material: Replacement filter made of premium activated carbon with strong absorbency which can absorb and filter odors for a long quiet time. Do not rinse before use Size: The size of the carbon filters is 16cm 16.5cm, and the thickness is 1cm, you can cut them to any size you want. Suitable for: Odor filters fit well in dome litter and most other cat litter boxes with different shapes, help remove odor from litter box Keep the air fresh: Odor filters solve unpleasant litter odor problems - They do a good job of removing odors, keeping odors fresh and clean, keeping your pets healthy and good mood, make you live a happy life with your pets Package Included: You will receive 6 replacement cat litter filters, and it needs to be replaced every 2-3 month. Sufficient quantity for substitute