Kong Ming lock from the ancient China, it is a traditional Chinese intellectual toy. To make children grow up with happiness. Specially designed for kids to practise and improve their intelligence. It will test your brain, patience, and coordination with this frenetically fun puzzle. New style, have new challenge for the people who like to play brain teaser puzzles. This classic puzzle will give you many hours of fun. They are great for on-the-go and road trips. Great fun for all the family, keeps the kids busy for hours. Makes a wonderful gift for that someone special.