The Spectrum case was introduced as a part of an update released on 15th of March 2017. The weapon case contains 17 community-designed skins, with a chance to open special super rare quality knife finishes.
The 17 skins that you can open in the spectrum case include: 2 covert, 3 classified, 5 restricted and 7 mil-spec rarity weapon skins.
To open this case you will need to have a spectrum case key in your steam inventory. When opening the spectrum case you can get the following skins:
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