1. Made from transparent materials, and different types of cylinders constitute various knotting training spaces;
2. Unique installation method design makes it easily to replace cylinders and save spaces effectively;
3. Methods available to practise knotting: knotting with single hand, knotting with both hands, knotting with instruments;
6. Methods available to practise knotting: single knot, square knot, triple knot and surgical knot, and identification false knot, slip knot;
7. Allow to simulate multiple knotting conditions: knotting in surgical small incision, knotting in deep abdominal cavity and pelvic cavity and angularly knotting in deep large incision, etc.