That's the edible cartilage part, which is commonly known as the brittle bone. It is very low in fat and not high in calories.

Crisp bone, also known as the treasure in the palm of your hand, common chicken crisp bone, pig crisp bone, respectively, located in the chicken keel protruding front, the combination of pig bone surface. Crispy bones melt in your mouth and are rich in calcium, making them ideal for the elderly and children who need calcium supplements. Animal cartilage contains chondroitin sulfate material, which is the main component of cartilage, can promote cartilage metabolism, protect cartilage tissue, slow down the degeneration of articular cartilage, etc., and often eat to avoid excessive wear and tear of articular cartilage.