Cats Desire Biodegradable Litter Boxes allow options. Patented moisture barrier interior and design provides the ability to use your favorite cat litter, (clumping clay recommended). Open or enclosed as you and your cat needs, (tray or closed box). Each tray is 17 inches wide, 19 inches long and 8.5 inches tall. As an enclosed litter box it is 17 inches wide, 19 long and 17 inches tall. Case includes 10 trays, with an attractive shelf sleeve on each tray. Minimum order 20 trays=2 cases.