NYLABONE Durable BoneOriginal 7.5Nylabone durable is a long lasting chew designed for powerful chewers. Be sure to select the right chew and size for your dogs chewing style. Different dogs have different chewing styles even within the same breed. Bristles raised during chewing help clean teeth and the cleaning action helps control plaque and tartar build up. Nylabone Durable is not consumable but small shavings no larger than a grain of rice should pass through. Replace when knuckles are worn down.IngredientsNylon and flavor impregnated.