Cats Desire Disposable Biodegradable Top-Side Entry Litter Boxes.
The lid also can be used as the bottom for a low entry for kittens and senior cats. New Design! The lid can be used to reinforce the bottom, or to create a covered litter box. Large 9 inch diameter perforated hole for top lid use or optional front entry biodegradable litter box. Each complete litter box set contains 3 pieces; a bottom, a lid and a multi-purpose pad.