Description This model consists of 1 normal knee joint and 3 degenerative diseased knee joint models, showing a comparison of a normal knee with a progressively degenerated knee. The PVC material is well made, and the base is removable. It is suitable for teaching explanation, doctor patient communication, model decoration, learning and research. Intuitive teaching aids, 4 stage knee joint disease model, detachable, it can be used in orthopedics, massage, teaching, etc. Life size with lifelike and accurate details. Specification: Material: PVC polyvinyl chloride Size Chart: 26.7x15.8x15.5cm/10.51x6.22x6.10inch Package Includes: 1 Piece 4 Stage Knee Joint Disease Model Note: 1. This is not infant toy , please take away from kids to avoid eating. 2. Please allow slightly error due to manual measurement. 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item.