This is a educational construction kit assembled from various materials (plastic, metal, etc.).
Here's a super-detailed model of one of the most complex biological machines in existence: the human hand! Touted as a "new type of puzzle," the model features 28 highly detailed prepainted parts that can be removed and reinstalled, showing in detail the bones, muscles, tendons, and vascularity of the hand. Includes an illustrated guidebook (in Japanese) and a stand. Great for students of biology! No scale is given, but it seems to be about half the size of a normal adult human hand.