Playing and pulling not only helping dogs to exercise their gums but also help polish their teeth. FOFOS Born Wild Cross Ball adds more fun exercise, relieves stress and builds good relationships between us and the dog. The Born Wild Cross Ball is made of ballistic nylon that is thick, durable but soft, ensuring long-lasting playability. It is sewed neatly without edge. The materials are soft so it will not hurt either our hand or cut the mouth of the dog. Size: 18x15x15cm