This willow ball from jr farm has a delicious secret once your pet has chewed through the willow it will discover the sweet smelling meadow hay the untreated willow is non toxic and safe for your pet and its a great toy for your pet to roll and push round the cage diameter approx 15 cm please note as with any other product please supervise your pet with this toy check the product regularly for sharp points caused by your pets chewing and replace the toy if it is damaged or missing any