An interactive toy that's tested dog tough! Fill with dog food, or any of your dog's favourite snacks for interactive fun. You can even turn meal time into a treasure hunt by feeding your dog out of the Triple Crown Everlasting Fun Ball. Its made from an exclusively designed material that is both durable and puncture resistant to hold up to even the toughest chewers. Large is 4" diameter(approx 10cm) and Medium/Large is 3.5" (approx 9cm) Medium is 2.75" diameter(approx 6.5cm).