Nylabone DuraChewBone is designed for powerful chewers. Bristles raised during chewing help clean teeth and control plaque and tartar build-up. Nylabones are not digestible and may be washed in warm water with nontoxic detergent. Materials: Nylon, natural flavors Options: Small: 0-25 pounds Medium: 26-35 pounds Large: 36-50 pounds X-large: 50 pounds Flavor: Original Duration of treatment: Use as directed Count: One (1) bone Package contents: One (1) bone Safety: These bones are non-digestible This supplement is for animal use only. Keep out of reach of children and other animals. Consult with your veterinarian before using this product. Due to the personal nature of this product, we are unable to accept returns.