The ScoopFree disposable litter tray is made from recycled materials and pre-filled with premium crystal litter that is free of perfumes and dyes. The crystal litter reduces odor better than clay and clumping litter, and the tray includes a covered waste compartment that locks in odors. It is completely disposable for hands-off convenience, so you don't have to touch or smell messy waste. After a few weeks, simply toss the tray in the provided disposal bag and replace with a new one. Each tray lasts up to 30 days, depending on number of cats. Not intended for kittens under 6 months old.