The best way of making science easier is to have attractive scientific models in the classroom, where a student can constantly be in touch with scientific facts and concepts. Life Size 3 part human skull with removable calvarium is an ideal pick to keep in science lab and classrooms. It comes with detailed study manual representing all the features that are numbered. It is made of high-quality PVC plastic which is corrosion and rust resistant and is durable. This is a medical Grade Human Skull that can be used at all grade levels. The jaw is spring loaded. It has been cast from an original human skull