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Seems like Butterfly takes care of this problem and they added a new feature to distinguish real rubbers from fake ones.. In addition to the barcode on the back cover (I think this was copied too if i remember but dont have any pictures to compare right now..) they added a 7 digit lasercode on the front cover. I dont know if its for all Butterfly rubbers and worldwide but Butterfly Europe anounced to do this recently to fight the fake problems..