This is an excellent half-size model for demonstrating the basic anatomical features of the human skeleton. The carpals and tarsals are fused, but the rest of the skeleton has natural movement on the joints.  The heavy metal base and an extra measure of stability while the skeleton itself is constructed of rugged plastic. Features include: Unbreakable ribs; Stainless steel screws, brackets and strings to resist corrosion.  Comes with a detailed guide.  Measures 33.5 inches;  Weight 6 pounds.