Provide larger pets with the freedom to exercise. Bigger pets can now enjoy the world around them inside these colorful, oversized exercise balls. It s an excellent source of exercise for pet rats and chinchillas, plus its a fun roly-poly toy for ferrets and a neat pet carrier for guinea pigs. Available in four assorted colors, the Giant Run-About ball also fits perfectly onto Super Pet's Hamtrac Raceway for the safest and most controlled exercise environment. [return]. Encourage healthy exercise in a secure and safe way.[return]. Makes a great temporary holding area to keep your furry friend while you clean their home.[return]. 11.5" diameter is ideal for pet rats, guinea pigs, chinchillas or other small animals[return]. Fits perfectly with the Hamtrac Raceway[return]. Rainbow balls are available in six assorted colors ( tangerine, blueberry, watermelon, grape, lemon and lime ).