Features:
1. Made of transparent material, the five cylinders of different sizes to form the knot space.
2. Knot method: one-handed knot, hands knot France, equipment knotted law.
3. Knot types: single knot, square knot, triple junction and surgical knot debate fake knot, slip knot.
4. Simulate a variety of tie environment: such as angle knot, surgical knot a tie of the small incision, abdominal, pelvic deep Ministry knot, a large incision deep.