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Not neccessarely. You have to look for the letters S/S/B (Sega Spinmaster Bakugan) and "made in China" engraved onto the bakugan brawlers. If there is no such things on your bakugan then it is a fake one. Bakupearl are genuine bakugan but they are bigger than Bakugan from serie1 and serie2. There are also genuine huge bakugans (DEKA).