<p>Feature:\r1. Upgraded litter box filter, more carbon and higher filter, greatly improves the blocking and absorbing efficiency.\r2. Universal, it well fits most hooded litter boxes.\r3. Eco-friendly materials, made of activated carbon, it can absorb and filter odors for quite a long period, disposable, do not rinse.\r4. Include, 4pcs\/6pcs carbon activated filter, enough for substitute, average is 2-3 months between replacements.\rNote: This cats litter box filter uses high-molecular bonding material to attach good-quality powdered catalytic activated carbon to the foaming carrier. The activated carbon fiber filter cotton made by modern scientific technology has high carbon content and good adsorption. performance\rDescription:\rMaterial: Activated carbon fiber\rQuantity: 4 pieces, 6 pieces\rSize length * width: 15.5 * 16.5cm\rThickness: 1cm\rWeight: About 16g\/single piece\r\rPackage List:\rChoice 1:\r4pcs x Cats Litter Box Filter \rChoice 2:\r6pcs x Cats Litter Box Filter\r\r</p>