3-part numbered skull model is ideal for active use in teaching and demonstrations. Perfect for basic anatomical studies or an attractive medical gift. Natural cast, medical quality 3-part skull. Numbering identifies different areas. Now included with all 3B Scientific Anatomy models is the 3B Smart Anatomy app. This app allows users to register their 3B item to extend the warranty from 3 to 5 years plus free 1 year access to the 3B Smart Anatomy app which includes 23 Anatomy lectures, 117 interactive models and 39 quizzes.