JUMUU Cat Kitty Interactive Three Levers Pet Toy Amusement Plate Crazy Ball Disk Cat Scratching Ball Toy Materials: this cat ball is made with envirnomental-friendly PP materials. It's very easy to carry and move. Sturdy construction lasts longer than other scratchers. Three levels for exciting fun. Function: balls spin and roll to excite kittys' desire to play, can interact with pet cat and arouse the cat's curiosity, thus preventing the pet depression Design: stacked play station perfect for one or more cats. The ball is inside, the cat catch the ball, the ball will roll Advantage: non-skid pads at bottom and three balls included in this toy which can be replaced Size: 10 inches in diameter of the bottom and 6 inches in diameter of its top, with the height of 5.5 inches