This desktop skeleton is sure to provide years of learning fun, and is a great demonstration model for learning basic anatomical features. It features a movable jaw on springs and natural movement of the joints (with the exception of the fused carpals and tarsals). Constructed from rugged PVC with a plastic base.  Features include: unbreakable ribs, stainless steel screws, and brackets and springs resistant to corrosion. Labeled diagram included. Skeleton is made exclusively from high quality medical PVC.