Axis Scientific 3-Part Painted Human Skull Model | Life Size Plastic Colored Skull is a Medical Quality Molded from a Real Human Skull | Includes Detailed Product Manual | 3 Year Warranty The skull itself is based on the Axis Scientific 3-piece skull, a life sized skull model cast from a natural specimen. Uniquely, the Axis line of skulls does not have much visible external hardware. The removable calvarium is held in place securely with a pair of magnets and series of small pegs, allowing for a largely uninterrupted study of the skull. The mandible is held in place with high quality springs that allow natural movements of the jaw. The bony structures of the skull are identifiable with the use of the included colorful key card. Each bone and bony pair is painted a unique bright color for quick identification using the card. Bones that exist as pairs (ex. Parietal bones) are identified as a single color, making it even easier to locate both on the fly. Using the included study guide, one can identify the following, along with many others <ul class="a-unordered-list a-vertical"> Frontal Bone Sphenoidal Bone Lacrimal Bone Occipital Bone Palatine Bone All bones of the facial and cranial structure are identified with this model, with the exception of the auditory ossicles. Made by Axis Scientific. Measures 8x7x5 inches. Weighs 2 lb.