Classic 3-part 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. 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.