This super-sized amusement system is a safe, interactive toy for your small pets. Provide larger pets with the same freedom to exercise that smaller pets have enjoyed for years. Bigger pets can enjoy the world around them inside these colorful, oversized exercise balls. Mega Run-about Balls are 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. A perfect spot to keep your critter while cleaning their cage. Made from durable plastic with ventilated slits.