The PYROCUBE, a very simple product which is a combination of cakes and fountains, could be connected one by one without any extra rubber fuse tube required. It is quite simple to make a fireworks combination by just bare hands, easy, safe and convenient. It is the only pyrotechnic product that has such particular structure, patent number: EP16174669.8
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https://file.ac/xckVz3k-uME/