Middle School Mathematics Geometry Teaching Aids School Science and Technology Museum Student Science and Education Creative Octagonal Ball Burr Puzzle Gift for the Elderly

Kong Ming lock, also known as gossip lock and Luban lock, is a traditional combination of civil construction in ancient China, and is also a toy widely spread among Chinese people, there are also some names such as "Don't be bored", "Liu Zi Lianfang", "Monet he" and "difficult Wood. Kong Ming lock, without nails and ropes, is supported by the connection of its own structure, just like a piece of paper can stand up after being folded in half.