TWIX are made at two different factories – the Left TWIX factory and the Right TWIX factory. The two completely different companies are constantly trying to outdo one another. And while packs of regular TWIX are now labeled to let consumers know which side is which, the Fun Size packs are not. So if you trick-or-treated at a house with TWIX Fun Size, you’d have no idea whether you got a Left or a Right TWIX.