Safe and fun for small pets to run! Key Product Features Medium size roll-n-around small pet exercise toy Perfect for small animals such as hamsters, gerbils Transparent ball color for increased visibility for both you and your pet Brightly colored doors allow for easy spotting ...Safe and fun for small pets to run! Key Product Features Medium size roll-n-around small pet exercise toy Perfect for small animals such as hamsters, gerbils Transparent ball color for increased visibility for both you and your pet Brightly colored doors allow for easy spotting Allow us to choose a color for you from the options of blue, green, or purple Measures 7.32" x 7.32" x 4.8" Big enough so that it is not easy to lose Weighs only 0.44 pounds Ware Manufacturing brand Specially designed running track so your pet can grip the surface and move it with ease This item is perfect for giving your pet the freedom to explore and promotes exercise, leading to a happy and healthy pet! Place your pet in the rolling ball, securely lock the lid and let them loose. The clear view rolling ball makes it fun to watch your pet play completely safe.