Natural Farm Beef Trachea Jerky Wrap is a combination of beef esophagus on the outside and beef trachea on the inside. The flavorful jerky wrap is a source of chondroitin and glucosamine, which helps support a dog’s hips and joints. Best for medium or hard chewers, the jerky wrap comes in 6 in. or 12 in. sizes, and is suitable for small, medium, large and extra-large dogs.