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►A unique and special metal brain teaser puzzle ►The puzzle may look simple, but it contains lots of mysteries ►It is usually easy to take apart but difficult to reassemble ►Not only it can enhance your ability, and can even be an extraordinary plan ►This is the best toys for developing intelligence and improving balance ability ►The puzzle became a popular toy for all, thanks to its functions of mind-body relaxing, intelligence boosting and making fingers more flexible