Shorty the mini skeleton with muscles is made from durable, unbreakable plastic. The portrayal of the muscle origins (red) and insertions (blue) on the left half adds to the anatomical value of the skeleton. Measures at: 37.0" and 3.75 lb. Features: 3-part skull (skullcap, base of skull and mandible), removable arms and legs, specially mounted hip joints to demonstrate natural rotation of the hips, muscles are numbered and 3 year guarantee. Comes on mounted base. 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.