Finally a litter box that provides options. Patented design allows for an open tray or an enclosed box. Use as a tray with or without the perforated front opening. Corrugated fiberboard material coated with a moisture barrier interior that allows the litter to perform its job. Use your favorite litter. 7-10 pounds of quality clumping clay is recommended. Large size for most cats. Each tray is 19x17x9.5 inches. Very tall sides at 9.5 inches to reduce litter scatter. Top and bottom combined as a covered box is 19x17x19 inches. Owner designed and uses the litter box daily with her Sassy Cat.U.S. Patent 9,258,977. 10 Trays included. Proudly sourced and made in the USA.