In biology, the skeleton or skeletal system is a strong framework that supports the body. External rigid frameworks, such as those found in some invertebrates, are termed exoskeletons. Internal rigid frameworks, such as those found in most vertebrates, are termed endoskeletons. The human skeleton comprises 206 bones. These bones meet at joints, the majority of which are freely movable, making the skeleton flexible and mobile. The skeleton also contains cartilage for elasticity. Ligaments are strong strips of fibrous connective tissue that hold bones together at joints, thereby stabilizing the skeleton during movement.

all is made by original basswood and first-class workmanship, as all 3D puzzles have no paint, so it is lead-free and safe toy for Children.

 Ages 6 and above.