Super Pet Run-About Ball 11.5" Clear: * Encourage healthy exercise in a secure and safe way * Makes a great temporary holding area to keep your furry friend while you clean its home * Perfectly sized 11.5" diameter ball for pet rats, guinea pigs, chinchillas or other small animals * Durable plastic construction with lock tight lid for safety * For added safety, Run-About Balls can be used with the Super Pet"s Hamtrac Raceway to provide your pet with a controlled exercise environment.