The 7 ¼” opening accommodates cats up to 16 pounds. Made of recycled Polypropylene in the USA, this durable and attractive litter box will make the chore of cleaning the litter box so easy. 18” wide - 20” high - 14.5 inches deep. Weighs just 9.5 lbs. Removable plug in back of unit makes full monthly cleaning easy. Holds approximately one ten pound bag of clay litter or one 8 lb bag of natural litter. Can be used with all clumping small and medium grain litters. Spin and empty once per day, per cat for best performance. Approved and used by cats around the world. Litter Spinner, “it finds it for you”.