Items come from games: drops, purchases and cases. They live in your Eleventake inventory, so they stay yours across games.
Each kind of item is marked as tradable, sellable on the market, or neither. Skins can have a condition, from Factory New to Battle-Scarred, a nametag, stickers or a kill counter.
Profile backgrounds and avatar frames are cosmetics you wear on your profile. Eleventake's own cosmetics cannot be traded or sold.
Star up to 6 items to show them on your profile. Who can see your inventory (everyone, friends, only you) is in Settings.
If a game retires an item, it is removed from every account. Its listings come off the market and buy order money goes back.