Features:

■ Made of transparent material, five different sizes of cylinders to form different knotting space

■ Knotting methods: one-handed, two-handed, and instrument knots

■ Knot types: single knot, square knot, triple knot and surgical knot, debate false knot, slip knot

■ Simulation of a variety of knotting environments: such as surgical knotting small incision knotting, abdominal, pelvic deep knotting, large incision deep angular knotting and so on.