X type or Zero? The X looks like a piece of bent wire, which a spring shop could replicate quite easily. The Zero seems to be a relatively complex stamping, which will be much more expensive for item one, but still only pennies per unit once you get into making thousands.
Zero. Yeah, it looks like it's pressed. From memory they have a little star or something on one side but I've also run them backwards in the other shoe with no problems.
X type or Zero? The X looks like a piece of bent wire, which a spring shop could replicate quite easily. The Zero seems to be a relatively complex stamping, which will be much more expensive for item one, but still only pennies per unit once you get into making thousands.