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Tank bubble is made up with several pentagon-shaped pieces. After it is inflated and assembled, it has many functions, such as a pad, a chair and a giant rolling ball. If it functions as a chair or a pad, it can provide people with convenience when family go on outdoor activity. While it functions as a rolling ball, parents and their children can play together and have a fun time. In order to solve the carrying problem, it was designed as an inflatable and portable product. Above all, just one product can solve all of your problems.