Designed for powerful chewers. Be sure to select the proper chew and size for your dog s particular chewing style. Bristles raised during chewing will help to clean the teeth, and this cleaning action will help control plaque and tartar bu. Nylon, Liver Meal. Not Consumable. Only Small Shavings, No Larger Than A Grain Of Rice, Are Able To Pass Through Safely. Replace When Knuckles On Ends Are Worn Down. Non Toxic. Size: Wolf. WOLF LIVER