Highly effective in adsorbing urine and fecal odors, ensuring a fresh-smelling home. Standard size of 7.8 inches in length and width, with a thickness of 0.4 inches, compatible with various hidden cat litter . Pack of 12 replacement carbon filters, providing a 6-month supply with recommended monthly changes. Easy to install without the need for tape; the carbon filter fits securely with 4 screws. These activated carbon charcoal filters are designed specifically for hidden cat litter boxes, effectively eliminating unpleasant odors from urine and feces. Their standard size allows for versatile use, and the pack of 12 ensures you have enough filters to maintain a fresh environment for your pets. Installation is straightforward, making it convenient for pet owners to keep their homes smelling clean. Color: As Shown Material: Sponge Package Contents: 12pcs Cat Litter Box Replacement Filters Only the above package content, other products are not included. Note: Light reflection 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.