It can only be opened if you know the trick otherwise nearly impossible to figure out the secret. inside for you to keep stuff safe. As a kind of Chinese traditional puzzle game, Luban lock carries with mysterious mathematical and physical principles.
Improve dexterity, tool for parent-child interaction, prevent Alzheimer's and more... All particles and shapes are even symmetrical, and logarithmic concepts are more helpful.
Perfect for hiding small beloved gifts you don't want to be easily seen by the curious others.such as finger rings or Jewelery. It can only be opened if you know the trick otherwise nearly impossible to figure out the secret. inside for you to keep stuff safe.