Are the Lunar WW/Nasus chromas limited?

Will they be taken from the store after the Lunar Revel ends or will they stay in case you got the skins? Just wondering if I should be getting them before they disppear D:

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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