"HAY BALL SIZE: Hay rack approx.Diameter is 3.15 inches, according to user requirements for yellow, roll, set Stainless steel ball design, it has a hanging hook, can be hung in the cage for small animals to vent their emotions, relieve pressure.^ REDUCE FOOD WASTER: Rabbit hay rack uses a unique design that combines fun and function to reduce food waste and keep bird cages clean.^ RABBIT FEEDERS HANGING: You can put chunks of pasture or snacks,hanging in the cage for a pet to play. Let the rabbit and guinea Pig eating while playing, releasing emotions to relax.^ PREFECT FOR HAY FEEDER: Great for bunny, chinchilla, guinea pigs, gerbil, ferret and other small animals playing or grass frame.^ If you have any questions about product quality or logistics damage, please contact us."