These are venison shank bones sourced from New Zealand deer raised on grass-fed pastures. Ziwi Peak has taken the shank bone, which is full of nutrients and marrow, and wrapped a beef oesophagus over the top. The bone is then naturally air dried to retain its goodness in a shelf-stable form. They’re long-lasting and dogs go crazy for them. Use these chews in conjunction with ZiwiPeak food. It’s a combination that’ll give your dog the best mix for overall long-term health and well-being.