2 pack combinations: rubber ball for cleaning, woven ball for molars Rubber ball: With a tooth design,will clean the dog of teeth like a toothbrush during feeding. Rubber material, soft and does not hurt the gums. Braided ball: resistant to bite, helping dogs to grind teeth, cats can also be used to grind paws. Small size: suitable for small and medium-sized animals,if use oversized ball，pets may be to give up playing balls. Please note: Animals need grind the teeth and this is an indispensable part.