Plastic. Good quality. Specimen features a 3-piece skull (calvarium cut) with a spring-held jaw. Bones of the vertebral column and the simulated intervertebral discs are strung in anatomical order on nylon filament. One hand and one foot are disarticulated. The other hand and foot are articulated with wire. The sternum is cast in one piece and is complete with ribs. All other bones are loose. With Human Anatomy Manual. Skeleton Storage Case (item# 249890A) is available separately.