The future of kitty cleanup is here! Includes (6) disposable litter boxes. No more plastic liners or trays that can create unhealthy odor or bacteria buildup. Kitty Sift offers convenient, healthy, and sustainable alternatives to the plastic litter box that protect your kitty and the planet. We strive to provide innovative and sustainable products for pet parents everywhere. Can be used as a standalone litter box, or as a liner. Replace every 2 to 3 weeks, or as needed; usage may vary based upon your litter type and kitty's habits.