Natural Chews for Dogs Hand tied, natural rawhide bones contain active enzymes to reduce bacteria and fight tartar buildup 1 Contains bio-available form of Vitamin C called STAY-C for added dental and immune system benefits, keeping teeth even cleaner 3 No artificial colors or flavors 5 Made from U.S. Beef Hides 4 One size made perfect for all dogs Dental Rawhide Twists are a natural, great tasting way to treat your dog and clean their teeth and gums at the same time. These irresistible multi sized rawhide twists will fight plaque and tarter buildup, inhibiting bacterial growth to reduce chances of gum disease. Each KONG Rawhide Twist is packed with Active Enzymes, Lisozyme and Lactoferrine with STAY-C for added dental and immune system benefits. STAY-C is a patent protected bio-available form of Vitamin C to help fight dental diseases and keep teeth extra clean.