ABS Vs PBT Keycaps - What Are The Main Differences?

If you've found this post then you've reached the stage of "what keycaps do I get" of the mechanical keyboard hobby.

Fake keycaps? Hello, want to ask please, if I bought a fake keycaps or they are real, because new ones doesn't have a light thru like old ones, can tell 2x less light, and inside they looks quite different? THX A LOT!!! HyperX PBT KEYCAPS US 519P1AA#ABA

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