The Premier Pet Disposable Crystal Litter Tray is used with the Premier Pet Auto-Scoop Crystal Litter Box System. The premium crystal litter is 99% dust free and controls odor 5x better than traditional clay litter. Simply place one of the disposable trays pre-portioned with crystal litter under the Auto-Scoop Crystal Litter Box and forget about it. Once your waste trap is full, simply remove the litter tray, cover with the included lid and toss it. Keep your cat's litter box smelling fresh in 3 easy steps!