Each ScoopFree Crystal Disposable Crystal Litter Tray is pre-filled with lightly scented lavender crystal litter . so all you have to do is load the tray in the litter box with no scooping . cleaning or refilling for weeks! These trays reduce mess in your home with a plastic lining to fight leaks . and with low-tracking crystals that stick inside the box instead of on your cat’s paws. Crystal litter absorbs urine and dries solid waste to quickly remove odors 5 times faster than clumping clay litter. When it’s time to clean up . just remove the disposable litter tray and throw it away. It doesn’t get much easier than that! These replacement trays are compatible with ScoopFree Crystal self-cleaning cat litter boxes. Your pet deserves the best. Trust PetSafe to help keep your pet healthy . safe and happy.