Kaytee FerreTrail Roll-About Ball Toy, Colors Vary Roll-about ball is safe for use inside any pet's home and is perfect for interactive playtime outside the home Encourages healthy play and exercise For ferrets, guinea pigs, dwarf rabbits, chinchillas, pet rats, and other small animals 10-Inch diameter with 6 openings for your pet to climb through Can be attached to ferretrail fun-nels for added fun Kaytee, formerly Super Pet.