The ball in the picture is for reference, this product is just a track.Product name: Hamster track, if you need to run the ball, you need to buy it separatelySingle sheet size: 47*9.5*4cmProduct color: blue, pinkApplicable species: hamsterProduct introduction: It can effectively control the range of activities of rats and mice, avoid accidents, and is suitable for hamster running balls of all sizesHow important is exercise to mice?Hamsters are used to going out in nature to find food, so exercise is very important for them. Using this track can also bring unlimited fun to the owner. In addition to saving space, it can also satisfy the running nature of Hamsters. And choosing the right running ball is also very important. The size of the mouse is proportional to the size of the running ball. With enough exercise space to exercise, the mouse can grow up healthily, and the owner can be more assured.