Description: Our Cat Litter Box is uses 3 identical sifting trays. Individually,each tray acts as a sift. but when any two are stacked together, they form a solid base. add the third tray and they create a perpetual sifting?Can quickly clean the cat litter and keep the cat litter clean. Specifications: Size: 17.2 * 12.6 * 4 in / 44 * 32 * 10 cm Material: plastic Suggest: 1.Put more cat sand to ensure the normal use of the cat sand basin 2.It is best to sifting the cat litter in the cat litter box in a few days to avoid clogging of Screening hole and failure to sifting the cat litter 3.If the hole of the litter box is blocked, you can directly rinse it with water 4.If the cat litter becomes a clump and blocks the screening hole, you can remove it with the cat sand shovel