Assembly steps: 1. Install the large intestine model for the torso model. 2. Place the pancreas model at the back of the stomach model. 3.Connect the small intestine model to the large intestine model and snap the stomach model and pancreas model into the gap of the indication part. 4.Insert the liver model into the gap of the indication part. Please be careful to insert the protruding part of the liver model inward. 5.Install the heart model. 6. Install the right lung model and the left lung model. 7. Install the rib cage model for the torso model. 8. Install the base at the bottom of the torso model, and the assembly is complete. Specifications: Name: Human Body Model Material: plastic Size: about 15*7cm/5.91*2.76inch Packing List: Human Body Model*1