Product SpecificationsWe offer 5 different sizes of rawhide dog chew bones for all breeds of dogs (over 3 months old). The 7.6cm /10cm /12.5cm rawhide bones are recommended for puppies and medium dogs, the large 20 /25cm rawhide bones are more suitable for medium and large dogs. Natural IngredientRefusal to use synthetic materials! Knuckle bones for dogs is made of 100% natural cowhide leather, which is made by cleaning, drying, compression molding and high temperature sterilization. No bleach, artificial ingredients, chemicals or preservatives. No added colors or flavors. Complementary Nutrition Our large bones for dogs are naturally rich in chondroitin, glucosamine and calcium to strengthen pet's muscles, improve joint flexibility. Dog bones containing 80% crude animal protein will produce enzymatic hydrolysis with saliva and then slowly dissolve into collagen for better digestion. It won't get stuck in their throat or hurt their mouth. Long Lasting Rawhide dog chews large with moderate hardness is great for puppy teething, large rawhide bones provide long-time chewing pleasure, relieve boredom and anxiety. Also cleans teeth naturally and helps control plaque and tartar buildup. In addition, rawhide for dogs can also be used as a toy for dogs to prevent them from biting daily necessities. Package Include6 packs of pressed rawhide bones ; 2 pieces per package; measures 3 inches (7.6cm).