RAINBOW RUN ABOUT BALL GIANTProvide 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. The giant Run about ball also fits perfectly onto Kaytee Hamtrac for the safest and most controlled exercise environment. Encourage healthy exercise in a secure and safe way Makes a great temporary holding area to keep your furry friend