Mann Co. Supply Crate Keys, Treasure Keys, and Refined Metal (which isn't marketable, so you won't find it there)
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Keys open crates which might contain very valuable items. Ref = refined metal, which serves as crafting material in TF2 (hats, weapons etc. - some are valuable, some are not). Keys can be bought in ingame store. Both keys and metal serve as currency among traders.
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I'm sorta new on trading on these things, and I know this is a really nooby question about this but I really don't understand. What are these tf2 keys, dota2 keys, and refs everyone wants to trade for?
I tried looking it up on the market but there many types of different keys for tf2/dota2 as well.
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