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Here's a look at the two main types we work with, what they're made from, and where each one works best.

Helium is a genuinely finite resource. It's not manufactured — it's extracted, in limited quantities, from natural gas deposits at a small number of sites worldwide, and once it's released into the atmosphere, it's gone for good; it's too light to be recaptured. There is no factory that "makes" more of it.