1. Unique knotting training design, made from transparent materials, and two different types of cylinders constitute various knotting training spaces;
2. Unique tension system to imitate different tissue tension, and equipped with warning system;
3. The simulated blood vessel filled with simulative blood is of high resilience, and strong sense of reality while operation and it is easy for replacement;
4. Allow to simulate multiple knotting conditions and practise different knotting methods.