Metallicons is an icon pack. It is not a stand alone application, you need a third party launcher to apply it.
What's included:
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4.478 HD icons (256x256)
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115 HD cloud wallpapers
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Launchers support: Action, Adw, AdwEX, Apex, Atom, Aviate, GO, Next,Nova, Smart, Solo,
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Icon masking for un-themed icons
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Dynamic calendar
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Alternative icons to choose