These are Free Range all natural treats. Gullets are the esophagus (the food pipe) of the cow which is high in Chondroitin (which helps with dogs joint health). These are great for medium and large dogs, and will make a longer lasting treat for a small dog. Although they are pretty hard, these are more of a treat than a long lasting chew. These gullets come from Angus beef cattle that have been humanely raised in pastures where nature provides the perfect diet. The result is beef that is higher in Omega-3 Fatty Acids, Beta Carotene, and CLA, and are yet lower in fat.