In Counter-Strike: Global Offensive, what's the rarity of discontinued skins called?

The rarity of discontinued skins in Counter-Strike: Global Offensive is called "Contraband" because these skins were part of specific cases or collections that are no longer available for purchase or drop. Due to their limited availability, these skins have become extremely rare and sought after by players. They are considered "Contraband" because they are no longer in circulation within the game's regular economy, making them highly valuable and desired by collectors and players.