Rollover© Stuffed Bones are 100% natural and are the hardest type of bone available on the market - beef. Rollover© cleans these beef bones, fills them with delicious Premium Chicken dog food ad bakes them to be a tempting chew treat. These natural baked bones are non-greasy and non-staining. With the delicious center of Rollover© Premium Chicken dog food, these bones are irresistible to dogs.