Several different types of hamster balls are available, from simple balls to novelty shapes such as cars. (yourpethamster.com)
If you look at match video you will see Le Coq breaking up City play, then playing simple ball to Santi. (justarsenal.com)
Run - abouts are a novel way to watch your pet exercise and are available in simple ball shapes, a wheel shape that propels a sport car, and the Hamtrac which is a system that can be used with either the ball or the car on an oval track made of interlocking plastic pieces. (second-opinion-doc.com)