Nine chain, Ming lock, puzzle, Huarong, and known as the four ancient Chinese mathematics intellectual toys. One of the most complex of nine rings, your brains, try to put it Break it! Wuhan Star Popular Science Technology Co., Ltd. Main products include: science exhibits, teaching equipment, laboratory boxes, Science and Technology Museum building, children's play equipment, laboratory construction, primary and secondary school general education equipment, science and technology museum exhibits, multimedia teaching equipment, such as vocational education, Warmly welcome all dealers or professional bodies to cooperate with us to jointly develop the market and contribute to the science and education.