Life Without - Compatible with Litter-Robot 4 carbon filters that provide a breath of fresh air, using the absorption prowess of activated carbon to eliminate odors and maintain a serene atmosphere at Precision Fit - Expertly designed, replacement filter compatible with Litter-Robot 4 slips on effortlessly, providing a custom fit that prevents any leaks, making maintenance both and satisfying Advanced Odor Neutralization - With each Litter-Robot compatible replacement carbon filter being filled with dense odor-absorbing particles, you'll experience freshness in every corner of your room. Long-Lasting Freshness - Charcoal litter filters work tirelessly, trapping odors and a consistently pleasant environment, reducing the need for frequent changes Optimized for Your Pet's Health - Litter box carbon filter prioritizes your cat's well-being, using safe, non-toxic materials that gently clean the air you breathe Color: Black Material: sponge Size: Thickness: 10 mm Package Contents: 12 *