A. Theme: Science B. Type: Bone model C. Color: White D. Material: Polyvinyl chloride (PVC) E. Structural features: This model is divided into two groups. Four sets of vertebrae with normal proportions are composed of normal vertebral bodies, and three sets of diseased vertebral body combinations can also be divided into two groups. The first group shows normal vertebral bodies, intervertebral discs, and intervertebral disc herniation; the second group shows vertebral bone and intervertebral disc degeneration, bone mass, and compression caused by osteoporosis. Polyvinyl chloride plastic cards are used, and the cards are made of plastic. F. Environmental protection features: Made of environmentally friendly polyvinyl chloride material and hand - painted. G. Dimensions: 27×15.8×10 cm H. Weight: 620 grams I. Packaging contents: 1 model J. Note: Only the above packaging contents are included, and no other products are included. K. Prompt: Light and different monitors may cause slight differences between the color of the item and the actual product. The allowable error for size measurement is plus or minus 1 - 3 cm.