Plastic. This fully flexible, life-sized vertebral column displays the occipital plate; cervical, thoracic, and lumbar vertebrae; sacrum; coccyx; and complete pelvis.
Vertebral arteries, spinal nerves, and a prolapsed L3 - L4 intervertebral disc are also shown. The regions of the vertebral column are color coded for easy identification. 
Includes metal stand for hanging and Human Anatomy Manual.