Knives

General Description
Knives are a core element of the game, almost always being some of the most rare and expensive items in the game. As an item, they are classified as red, or covert, ranking. However, the chance of getting a knife in any case is actually exponentially smaller than getting a non-knife covert. By buying the "More Knives" upgrades in the Upgrade section, you may increase the chances of obtaining a knife, but it is still very rare to get a knife in any case draw.

In a case draw, the knife panel is a yellow-colored panel, which is a different color than any other panels in the game to distinguish its value as a knife item. The flavor text reads "Rare Special Item". It does not say the name of the knife you will receive in most cases, however cases like the Breakout case will show that you will only acquire a butterfly knife. You can get almost any knife by opening any case besides the Breakout, Huntsman, Falchion, Shadow and Wilfire cases. For those, you will only be able to get Butterfly, Huntsman and Falchion knives respectively, along with Shadow Daggers and Bowie Knives in the Wildfire and Shadow cases. The advantage to opening these cases is that these knives are only available in their respective cases. For example, you can only get Shadow Daggers in the Shadow Case. You cannot get any other kind of knife in a Shadow Case.

For Chroma and Chroma 2 Cases are the only two cases where you can get the Damascus Steel, Doppler, Marble Fade, Tiger Tooth, Rust Coat and Ultraviolet knife skins. These skins can only be obtained on the Bayonet, Flip Knife, Gut Knife, Karambit and M9 Bayonet as theses skins are exclusive to the Chroma and Chroma 2 Cases. These are the only knife skins you can get from the Chroma and Chroma 2 Cases.

Knives can be sold anywhere between $30.00 to $2400 based on quality of the skin. The most expensive knife is a StatTrak™ Factory New Bayonet | Night.

TL:DR - Knives are very expensive and sometimes you can only get 1 knife per case. Most expensive knife is ST FN Bayonet | Night.