Bacon Flavour Nylabone is made from pure virgin nylon which is annealed after moulding, resulting in a therapeutic chew device which is strong, safe & very durable. The bristle-like projections that are raised on the surface of the bone as it is chewed massage the surface of the teeth & gums & help to prevent plaque from forming. Choose the largest size your dog can comfortably hold in his mouth in order to derive the greatest dental benefit.